diff --git a/src/app/app.component.html b/src/app/app.component.html
index 4dd83bd..00031de 100644
--- a/src/app/app.component.html
+++ b/src/app/app.component.html
@@ -1,4 +1,5 @@
 <cre-header></cre-header>
+<cre-global-alert-handler></cre-global-alert-handler>
 <div>
   <div class="dark-background"></div>
   <router-outlet></router-outlet>
diff --git a/src/app/app.component.ts b/src/app/app.component.ts
index 69b3e57..df904ac 100644
--- a/src/app/app.component.ts
+++ b/src/app/app.component.ts
@@ -1,9 +1,9 @@
-import {Component, Inject, PLATFORM_ID} from '@angular/core';
-import {isPlatformBrowser} from "@angular/common";
-import {AppState} from "./modules/shared/app-state";
-import {Observable} from "rxjs";
-import {SubscribingComponent} from "./modules/shared/components/subscribing.component";
-import {ActivatedRoute, Router} from "@angular/router";
+import {Component, Inject, PLATFORM_ID} from '@angular/core'
+import {isPlatformBrowser} from '@angular/common'
+import {AppState} from './modules/shared/app-state'
+import {SubscribingComponent} from './modules/shared/components/subscribing.component'
+import {ActivatedRoute, Router} from '@angular/router'
+import {ErrorService} from './modules/shared/service/error.service'
 
 @Component({
   selector: 'cre-root',
@@ -17,21 +17,20 @@ export class AppComponent extends SubscribingComponent {
   constructor(
     @Inject(PLATFORM_ID) private platformId: object,
     private appState: AppState,
+    errorService: ErrorService,
     router: Router,
     activatedRoute: ActivatedRoute
   ) {
-    super(activatedRoute, router)
+    super(errorService, activatedRoute, router)
   }
 
   ngOnInit() {
     this.isOnline = isPlatformBrowser(this.platformId)
-    super.ngOnInit();
+    super.ngOnInit()
 
     this.subscribe(
       this.appState.serverOnline$,
-      {
-        next: online => this.isServerOnline = online
-      }
+      online => this.isServerOnline = online
     )
   }
 
diff --git a/src/app/modules/accounts/pages/login/login.component.html b/src/app/modules/accounts/pages/login/login.component.html
index c02ca51..4f10431 100644
--- a/src/app/modules/accounts/pages/login/login.component.html
+++ b/src/app/modules/accounts/pages/login/login.component.html
@@ -4,9 +4,6 @@
       <mat-card-title>Connexion au système</mat-card-title>
     </mat-card-header>
     <mat-card-content>
-      <div *ngIf="invalidCredentials" class="alert alert-danger">
-        <p>Les identifiants entrés sont invalides.</p>
-      </div>
       <mat-form-field>
         <mat-label>Numéro d'employé</mat-label>
         <input matInput [formControl]="idFormControl" type="text"/>
diff --git a/src/app/modules/accounts/pages/login/login.component.ts b/src/app/modules/accounts/pages/login/login.component.ts
index 9f7b3ba..0601ec5 100644
--- a/src/app/modules/accounts/pages/login/login.component.ts
+++ b/src/app/modules/accounts/pages/login/login.component.ts
@@ -1,28 +1,38 @@
-import {Component, OnInit} from '@angular/core';
-import {FormBuilder, FormControl, FormGroup, Validators} from "@angular/forms";
-import {AccountService} from "../../services/account.service";
-import {Router} from "@angular/router";
+import {Component, OnInit} from '@angular/core'
+import {FormBuilder, FormControl, FormGroup, Validators} from '@angular/forms'
+import {AccountService} from '../../services/account.service'
+import {Router} from '@angular/router'
+import {ErrorHandler, ErrorModel, ErrorService} from '../../../shared/service/error.service'
 
 @Component({
   selector: 'cre-login',
   templateUrl: './login.component.html',
   styleUrls: ['./login.component.sass']
 })
-export class LoginComponent implements OnInit {
+export class LoginComponent implements ErrorHandler, OnInit {
+  handledErrorModels: ErrorModel[] = [{
+    filter: error => error.status === 401,
+    messageProducer: () => 'Les identifiants entrés sont invalides.'
+  }, {
+    filter: error => error.status === 404 || error.status === 403,
+    consumer: () => console.warn('No default user is defined on this computer')
+  }]
+
   form: FormGroup
   idFormControl: FormControl
   passwordFormControl: FormControl
 
-  invalidCredentials = false
-
   constructor(
     private formBuilder: FormBuilder,
     private accountService: AccountService,
+    private errorService: ErrorService,
     private router: Router
   ) {
   }
 
   ngOnInit(): void {
+    this.errorService.activeErrorHandler = this
+
     if (this.accountService.isLoggedIn()) {
       this.router.navigate(['/color'])
     }
@@ -39,8 +49,7 @@ export class LoginComponent implements OnInit {
     this.accountService.login(
       this.idFormControl.value,
       this.passwordFormControl.value,
-      () => this.router.navigate(["/color"]),
-      err => this.invalidCredentials = err.status === 401
+      () => this.router.navigate(['/color'])
     )
   }
 }
diff --git a/src/app/modules/accounts/services/account.service.ts b/src/app/modules/accounts/services/account.service.ts
index c59dd0d..572d2ce 100644
--- a/src/app/modules/accounts/services/account.service.ts
+++ b/src/app/modules/accounts/services/account.service.ts
@@ -6,6 +6,7 @@ import {HttpClient, HttpResponse} from '@angular/common/http'
 import {environment} from '../../../../environments/environment'
 import {ApiService} from '../../shared/service/api.service'
 import {Employee, EmployeePermission} from '../../shared/model/employee'
+import {ErrorService} from '../../shared/service/error.service'
 
 @Injectable({
   providedIn: 'root'
@@ -16,7 +17,8 @@ export class AccountService implements OnDestroy {
   constructor(
     private http: HttpClient,
     private api: ApiService,
-    private appState: AppState
+    private appState: AppState,
+    private errorService: ErrorService
   ) {
   }
 
@@ -38,24 +40,12 @@ export class AccountService implements OnDestroy {
           takeUntil(this.destroy$),
         ).subscribe({
         next: employee => this.appState.authenticatedEmployee = employee,
-        error: err => {
-          if (err.status === 0 && err.statusText === 'Unknown Error' || err.status === 502) {
-            this.appState.isServerOnline = false
-          } else {
-            this.appState.isServerOnline = true
-            if (err.status === 404 || err.status === 403) {
-              console.error('No default user is defined on this computer')
-            } else {
-              console.error('An error occurred while authenticating the default user')
-              console.error(err)
-            }
-          }
-        }
+        error: err => this.errorService.handleError(err)
       })
     }
   }
 
-  login(id: number, password: string, success: () => void, error: (err) => void) {
+  login(id: number, password: string, success: () => void) {
     const loginForm = {id, password}
     this.http.post<any>(`${environment.apiUrl}/login`, loginForm, {
       withCredentials: true,
@@ -72,14 +62,7 @@ export class AccountService implements OnDestroy {
           this.setLoggedInEmployeeFromApi()
           success()
         },
-        error: err => {
-          if (err.status === 0 && err.statusText === 'Unknown Error' || err.status === 502) {
-            this.appState.isServerOnline = false
-          } else {
-            this.appState.isServerOnline = true
-            error(err)
-          }
-        }
+        error: err => this.errorService.handleError(err)
       })
   }
 
@@ -96,7 +79,7 @@ export class AccountService implements OnDestroy {
           this.checkAuthenticationStatus()
           success()
         },
-        error: err => console.error(err)
+        error: err => this.errorService.handleError(err)
       })
   }
 
@@ -112,10 +95,7 @@ export class AccountService implements OnDestroy {
       )
       .subscribe({
         next: employee => this.appState.authenticatedEmployee = employee,
-        error: err => {
-          console.error('Could not get the logged in employee from the API: ')
-          console.error(err)
-        }
+        error: err => this.errorService.handleError(err)
       })
   }
 }
diff --git a/src/app/modules/colors/components/images-editor/images-editor.component.ts b/src/app/modules/colors/components/images-editor/images-editor.component.ts
index eab25c5..c53a23b 100644
--- a/src/app/modules/colors/components/images-editor/images-editor.component.ts
+++ b/src/app/modules/colors/components/images-editor/images-editor.component.ts
@@ -1,10 +1,11 @@
-import {Component, Input} from '@angular/core';
-import {Recipe} from "../../../shared/model/recipe.model";
-import {SubscribingComponent} from "../../../shared/components/subscribing.component";
-import {ActivatedRoute, Router} from "@angular/router";
-import {Observable} from "rxjs";
-import {RecipeImageService} from "../../services/recipe-image.service";
-import {environment} from "../../../../../environments/environment";
+import {Component, Input} from '@angular/core'
+import {Recipe} from '../../../shared/model/recipe.model'
+import {SubscribingComponent} from '../../../shared/components/subscribing.component'
+import {ActivatedRoute, Router} from '@angular/router'
+import {Observable} from 'rxjs'
+import {RecipeImageService} from '../../services/recipe-image.service'
+import {environment} from '../../../../../environments/environment'
+import {ErrorService} from '../../../shared/service/error.service'
 
 @Component({
   selector: 'cre-images-editor',
@@ -20,10 +21,11 @@ export class ImagesEditorComponent extends SubscribingComponent {
 
   constructor(
     private recipeImageService: RecipeImageService,
+    errorService: ErrorService,
     router: Router,
     activatedRoute: ActivatedRoute
   ) {
-    super(activatedRoute, router)
+    super(errorService, activatedRoute, router)
   }
 
   ngOnInit() {
@@ -36,7 +38,7 @@ export class ImagesEditorComponent extends SubscribingComponent {
     const image = event.target.files[0]
     this.subscribe(
       this.recipeImageService.save(image, this.recipe.id),
-      {next: () => this.loadImagesIds()}
+      () => this.loadImagesIds()
     )
   }
 
@@ -47,7 +49,7 @@ export class ImagesEditorComponent extends SubscribingComponent {
   delete(imageId: number) {
     this.subscribe(
       this.recipeImageService.delete(imageId, this.recipe.id),
-      {next: () => this.loadImagesIds()}
+      () => this.loadImagesIds()
     )
   }
 
diff --git a/src/app/modules/colors/components/mix-editor/mix-editor.component.ts b/src/app/modules/colors/components/mix-editor/mix-editor.component.ts
index 5572641..e3e212d 100644
--- a/src/app/modules/colors/components/mix-editor/mix-editor.component.ts
+++ b/src/app/modules/colors/components/mix-editor/mix-editor.component.ts
@@ -1,20 +1,21 @@
-import {Component, EventEmitter, Input, Output, ViewChild} from '@angular/core';
-import {Mix, MixMaterial, Recipe} from "../../../shared/model/recipe.model";
-import {SubscribingComponent} from "../../../shared/components/subscribing.component";
-import {MixService} from "../../services/mix.service";
-import {Observable} from "rxjs";
-import {RecipeService} from "../../services/recipe.service";
-import {Material} from "../../../shared/model/material.model";
-import {MaterialService} from "../../../material/service/material.service";
-import {MaterialType} from "../../../shared/model/materialtype.model";
-import {MaterialTypeService} from "../../../material-type/service/material-type.service";
-import {FormBuilder, FormControl, FormGroup, Validators} from "@angular/forms";
-import {UNIT_MILLILITER} from "../../../shared/units";
-import {MatTable} from "@angular/material/table";
-import {ActivatedRoute, Router} from "@angular/router";
-import {ConfirmBoxComponent} from "../../../shared/components/confirm-box/confirm-box.component";
-import {AccountService} from "../../../accounts/services/account.service";
-import {EmployeePermission} from "../../../shared/model/employee";
+import {Component, EventEmitter, Input, Output, ViewChild} from '@angular/core'
+import {Mix, MixMaterial, Recipe} from '../../../shared/model/recipe.model'
+import {SubscribingComponent} from '../../../shared/components/subscribing.component'
+import {MixService} from '../../services/mix.service'
+import {Observable} from 'rxjs'
+import {RecipeService} from '../../services/recipe.service'
+import {Material} from '../../../shared/model/material.model'
+import {MaterialService} from '../../../material/service/material.service'
+import {MaterialType} from '../../../shared/model/materialtype.model'
+import {MaterialTypeService} from '../../../material-type/service/material-type.service'
+import {FormBuilder, FormControl, FormGroup, Validators} from '@angular/forms'
+import {UNIT_MILLILITER} from '../../../shared/units'
+import {MatTable} from '@angular/material/table'
+import {ActivatedRoute, Router} from '@angular/router'
+import {ConfirmBoxComponent} from '../../../shared/components/confirm-box/confirm-box.component'
+import {AccountService} from '../../../accounts/services/account.service'
+import {EmployeePermission} from '../../../shared/model/employee'
+import {ErrorService} from '../../../shared/service/error.service'
 
 @Component({
   selector: 'cre-mix-editor',
@@ -29,7 +30,7 @@ export class MixEditorComponent extends SubscribingComponent {
   @Input() recipeId: number | null
   @Input() materials: Material[]
 
-  @Output() save = new EventEmitter<any>();
+  @Output() save = new EventEmitter<any>()
 
   mix: Mix | null
   recipe: Recipe | null
@@ -52,43 +53,43 @@ export class MixEditorComponent extends SubscribingComponent {
     private materialTypeService: MaterialTypeService,
     private accountService: AccountService,
     private formBuilder: FormBuilder,
+    errorService: ErrorService,
     router: Router,
     activatedRoute: ActivatedRoute
   ) {
-    super(activatedRoute, router)
+    super(errorService, activatedRoute, router)
   }
 
   ngOnInit() {
-    super.ngOnInit();
+    super.ngOnInit()
 
     this.mixId = this.urlUtils.parseIntUrlParam('id')
     if (this.mixId) {
       this.editionMode = true
     }
 
-    this.subscribe(
-      this.recipeService.getById(this.recipeId),
-      {
-        next: r => {
-          this.recipe = r
-          if (this.editionMode) {
-            this.subscribe(
-              this.mixService.getById(this.mixId),
-              {
-                next: m => {
-                  this.mix = m
-                  this.mixMaterials = this.mixService.extractMixMaterials(this.mix)
-                  this.generateForm()
-                }, error: err => this.handleNotFoundError(err, '/color/list')
-              }
-            )
-          } else {
-            this.mixMaterials.push({})
-            this.generateForm()
-          }
-        },
-        error: err => this.handleNotFoundError(err, '/color/list')
-      }
+    this.subscribeEntityById(
+      this.recipeService,
+      this.recipeId,
+      r => {
+        this.recipe = r
+        if (this.editionMode) {
+          this.subscribeEntityById(
+            this.mixService,
+            this.mixId,
+            m => {
+              this.mix = m
+              this.mixMaterials = this.mixService.extractMixMaterials(this.mix)
+              this.generateForm()
+            },
+            '/color/list'
+          )
+        } else {
+          this.mixMaterials.push({})
+          this.generateForm()
+        }
+      },
+      '/color/list'
     )
     this.materialTypes$ = this.materialTypeService.all
   }
@@ -118,8 +119,10 @@ export class MixEditorComponent extends SubscribingComponent {
   }
 
   materialUsePercentages(mixMaterial: any) {
-    if (!mixMaterial.materialId) return null
-    const material = this.getMaterialFromId(mixMaterial.materialId);
+    if (!mixMaterial.materialId) {
+      return null
+    }
+    const material = this.getMaterialFromId(mixMaterial.materialId)
     mixMaterial.percents = material && material.materialType.usePercentages
     return mixMaterial.percents
   }
diff --git a/src/app/modules/colors/components/mix-table/mix-table.component.ts b/src/app/modules/colors/components/mix-table/mix-table.component.ts
index ca766b9..d4f7da4 100644
--- a/src/app/modules/colors/components/mix-table/mix-table.component.ts
+++ b/src/app/modules/colors/components/mix-table/mix-table.component.ts
@@ -1,11 +1,13 @@
-import {Component, EventEmitter, Input, Output, ViewChild} from '@angular/core';
-import {Mix, MixMaterial, Recipe} from "../../../shared/model/recipe.model";
-import {Subject} from "rxjs";
-import {SubscribingComponent} from "../../../shared/components/subscribing.component";
-import {convertMixMaterialQuantity, UNIT_MILLILITER} from "../../../shared/units";
-import {ActivatedRoute, Router} from "@angular/router";
-import {PtouchPrinter} from "../../ptouchPrint"
-import {ConfirmBoxComponent} from "../../../shared/components/confirm-box/confirm-box.component";
+import {Component, EventEmitter, Input, Output, ViewChild} from '@angular/core'
+import {Mix, MixMaterial, Recipe} from '../../../shared/model/recipe.model'
+import {Subject} from 'rxjs'
+import {SubscribingComponent} from '../../../shared/components/subscribing.component'
+import {convertMixMaterialQuantity, UNIT_MILLILITER} from '../../../shared/units'
+import {ActivatedRoute, Router} from '@angular/router'
+import {PtouchPrinter} from '../../ptouchPrint'
+import {ConfirmBoxComponent} from '../../../shared/components/confirm-box/confirm-box.component'
+import {ErrorService} from '../../../shared/service/error.service'
+import {AlertService} from '../../../shared/service/alert.service'
 
 @Component({
   selector: 'cre-mix-table',
@@ -23,7 +25,6 @@ export class MixTableComponent extends SubscribingComponent {
   @Input() units$: Subject<string>
   @Input() deductErrorBody
   @Input() editionMode: boolean
-  @Input() printingError = 2
   @Output() locationChange = new EventEmitter<{ id: number, location: string }>()
   @Output() quantityChange = new EventEmitter<{ id: number, materialId: number, quantity: number }>()
   @Output() deduct = new EventEmitter<void>()
@@ -37,14 +38,16 @@ export class MixTableComponent extends SubscribingComponent {
   printer: PtouchPrinter | null
 
   constructor(
+    private alertService: AlertService,
+    errorService: ErrorService,
     router: Router,
     activatedRoute: ActivatedRoute
   ) {
-    super(activatedRoute, router)
+    super(errorService, activatedRoute, router)
   }
 
   ngOnInit() {
-    super.ngOnInit();
+    super.ngOnInit()
 
     if (this.editionMode) {
       this.mixColumns = this.COLUMNS_STATIC
@@ -58,9 +61,7 @@ export class MixTableComponent extends SubscribingComponent {
 
     this.subscribe(
       this.units$,
-      {
-        next: u => this.convertQuantities(u)
-      }
+      u => this.convertQuantities(u)
     )
   }
 
@@ -90,7 +91,9 @@ export class MixTableComponent extends SubscribingComponent {
   }
 
   getTotalQuantity(index: number = -1): number {
-    if (index === -1) index = this.computedQuantities.length - 1
+    if (index === -1) {
+      index = this.computedQuantities.length - 1
+    }
     let totalQuantity = 0
     for (let i = 0; i <= index; i++) {
       totalQuantity += this.calculateQuantity(i)
@@ -121,16 +124,32 @@ export class MixTableComponent extends SubscribingComponent {
       return
     }
     this.printer = new PtouchPrinter({
-      template: "Couleur",
+      template: 'Couleur',
       lines: [
-        {name: "color", value: this.recipe.name},
-        {name: "banner", value: this.recipe.company.name},
-        {name: "base", value: base.name},
-        {name: "description", value: this.recipe.description}
+        {name: 'color', value: this.recipe.name},
+        {name: 'banner', value: this.recipe.company.name},
+        {name: 'base', value: base.name},
+        {name: 'description', value: this.recipe.description}
       ]
     })
-    const errorCode = await this.printer.print()
-    this.printingErrorChange.emit(errorCode)
+    const exitCode = await this.printer.print()
+    switch (exitCode) {
+      case PrintingExitCode.PrintingInProgress:
+        this.alertService.pushSuccess('Impression en cours. Cette opération peut prendre quelques secondes')
+        break
+      case PrintingExitCode.ExtensionNotInstalled:
+        this.alertService.pushError('L\'extension b-Pac n\'est pas installée')
+        break
+      case PrintingExitCode.NoBaseFound:
+        this.alertService.pushError('Il n\'y a pas de base dans ce mélange')
+        break
+      case PrintingExitCode.GenericPrintingError:
+        this.alertService.pushError('Une erreur est survenue durant l\'impression')
+        break
+      default:
+        this.errorService.pushUnknownError()
+        break
+    }
   }
 
   private emitQuantityChangeEvent(index: number) {
@@ -158,3 +177,11 @@ export class MixTableComponent extends SubscribingComponent {
     return this.computedQuantities[0].quantity * (computedQuantity.quantity / 100)
   }
 }
+
+enum PrintingExitCode {
+  PrintingInProgress = 1,
+
+  ExtensionNotInstalled = -1,
+  NoBaseFound = 98,
+  GenericPrintingError = 99
+}
diff --git a/src/app/modules/colors/components/mixes-card/mixes-card.component.html b/src/app/modules/colors/components/mixes-card/mixes-card.component.html
index f22e4d6..0c8ffeb 100644
--- a/src/app/modules/colors/components/mixes-card/mixes-card.component.html
+++ b/src/app/modules/colors/components/mixes-card/mixes-card.component.html
@@ -13,8 +13,7 @@
         [editionMode]="editionMode"
         (quantityChange)="quantityChange.emit($event)"
         (locationChange)="locationChange.emit($event)"
-        (deduct)="deduct.emit(mix.id)"
-        [(printingError)]="printingError">>
+        (deduct)="deduct.emit(mix.id)">
       </cre-mix-table>
     </ng-container>
   </mat-card-content>
diff --git a/src/app/modules/colors/components/mixes-card/mixes-card.component.ts b/src/app/modules/colors/components/mixes-card/mixes-card.component.ts
index 63ee4e8..920132a 100644
--- a/src/app/modules/colors/components/mixes-card/mixes-card.component.ts
+++ b/src/app/modules/colors/components/mixes-card/mixes-card.component.ts
@@ -11,7 +11,6 @@ export class MixesCardComponent {
   @Input() recipe: Recipe
   @Input() units$: Subject<string>
   @Input() deductErrorBody: any
-  @Input() printingError = 2
   @Input() editionMode = false
 
   @Output() locationChange = new EventEmitter<{ id: number, location: string }>()
diff --git a/src/app/modules/colors/pages/add/add.component.html b/src/app/modules/colors/pages/add/add.component.html
index f9d4e9d..f95fa2b 100644
--- a/src/app/modules/colors/pages/add/add.component.html
+++ b/src/app/modules/colors/pages/add/add.component.html
@@ -1,8 +1,6 @@
 <cre-entity-add
   title="Création d'une recette"
   backButtonLink="/color/list"
-  [unknownError]="unknownError"
-  [customError]="errorMessage"
   [formFields]="formFields"
   (submit)="submit($event)">
 </cre-entity-add>
diff --git a/src/app/modules/colors/pages/add/add.component.ts b/src/app/modules/colors/pages/add/add.component.ts
index 3fc5e33..6eef38b 100644
--- a/src/app/modules/colors/pages/add/add.component.ts
+++ b/src/app/modules/colors/pages/add/add.component.ts
@@ -1,18 +1,19 @@
-import {Component} from '@angular/core';
-import {SubscribingComponent} from "../../../shared/components/subscribing.component";
-import {RecipeService} from "../../services/recipe.service";
-import {FormField} from "../../../shared/components/entity-add/entity-add.component";
-import {FormBuilder, Validators} from "@angular/forms";
-import {CompanyService} from "../../../company/service/company.service";
-import {map} from "rxjs/operators";
-import {ActivatedRoute, Router} from "@angular/router";
+import {Component} from '@angular/core'
+import {ErrorHandlingComponent} from '../../../shared/components/subscribing.component'
+import {RecipeService} from '../../services/recipe.service'
+import {FormField} from '../../../shared/components/entity-add/entity-add.component'
+import {Validators} from '@angular/forms'
+import {CompanyService} from '../../../company/service/company.service'
+import {map} from 'rxjs/operators'
+import {ActivatedRoute, Router} from '@angular/router'
+import {ErrorModel, ErrorService} from '../../../shared/service/error.service'
 
 @Component({
   selector: 'cre-add',
   templateUrl: './add.component.html',
   styleUrls: ['./add.component.sass']
 })
-export class AddComponent extends SubscribingComponent {
+export class AddComponent extends ErrorHandlingComponent {
   formFields: FormField[] = [
     {
       name: 'name',
@@ -71,28 +72,21 @@ export class AddComponent extends SubscribingComponent {
       })))
     }
   ]
-  unknownError = false
-  errorMessage: string | null
 
   constructor(
     private recipeService: RecipeService,
     private companyService: CompanyService,
+    errorService: ErrorService,
     router: Router,
     activatedRoute: ActivatedRoute
   ) {
-    super(activatedRoute, router)
+    super(errorService, activatedRoute, router)
   }
 
   submit(values) {
     this.subscribe(
       this.recipeService.save(values.name, values.description, values.sample, values.approbationDate, values.remark, values.company),
-      {
-        next: recipe => this.urlUtils.navigateTo(`/color/edit/${recipe.id}`),
-        error: err => {
-          this.unknownError = true
-          console.error(err)
-        }
-      }
+      recipe => this.urlUtils.navigateTo(`/color/edit/${recipe.id}`)
     )
   }
 }
diff --git a/src/app/modules/colors/pages/edit/edit.component.html b/src/app/modules/colors/pages/edit/edit.component.html
index 3baa01f..0dba9d5 100644
--- a/src/app/modules/colors/pages/edit/edit.component.html
+++ b/src/app/modules/colors/pages/edit/edit.component.html
@@ -1,11 +1,4 @@
 <div *ngIf="recipe">
-  <div *ngIf="!recipe.mixes" class="alert alert-warning m-3">
-    <p>Il n'y a aucun mélange dans cette recette</p>
-  </div>
-  <div *ngIf="recipe.steps.length <= 0" class="alert alert-warning m-3">
-    <p>Il n'y a aucune étape dans cette recette</p>
-  </div>
-
   <div class="action-bar backward">
     <div class="d-flex flex-column">
       <div class="mt-1 pb-2">
@@ -33,8 +26,6 @@
         deleteConfirmMessage="Voulez-vous vraiment supprimer la couleur {{recipe.name}}?"
         [entity]="recipe"
         [formFields]="formFields"
-        [unknownError]="unknownError"
-        [customError]="errorMessage"
         [disableButtons]="true"
         [noTopMargin]="true">
       </cre-entity-edit>
diff --git a/src/app/modules/colors/pages/edit/edit.component.ts b/src/app/modules/colors/pages/edit/edit.component.ts
index a493da4..bbea551 100644
--- a/src/app/modules/colors/pages/edit/edit.component.ts
+++ b/src/app/modules/colors/pages/edit/edit.component.ts
@@ -1,22 +1,24 @@
-import {Component, ViewChild} from '@angular/core';
-import {SubscribingComponent} from "../../../shared/components/subscribing.component";
-import {Recipe} from "../../../shared/model/recipe.model";
-import {RecipeService} from "../../services/recipe.service";
-import {ActivatedRoute, Router} from "@angular/router";
-import {Validators} from "@angular/forms";
-import {Subject} from "rxjs";
-import {UNIT_GALLON, UNIT_LITER, UNIT_MILLILITER} from "../../../shared/units";
-import {AccountService} from "../../../accounts/services/account.service";
-import {EmployeePermission} from "../../../shared/model/employee";
-import {EntityEditComponent} from "../../../shared/components/entity-edit/entity-edit.component";
-import {ImagesEditorComponent} from "../../components/images-editor/images-editor.component";
+import {Component, ViewChild} from '@angular/core'
+import {ErrorHandlingComponent, SubscribingComponent} from '../../../shared/components/subscribing.component'
+import {Recipe} from '../../../shared/model/recipe.model'
+import {RecipeService} from '../../services/recipe.service'
+import {ActivatedRoute, Router} from '@angular/router'
+import {Validators} from '@angular/forms'
+import {Subject} from 'rxjs'
+import {UNIT_GALLON, UNIT_LITER, UNIT_MILLILITER} from '../../../shared/units'
+import {AccountService} from '../../../accounts/services/account.service'
+import {EmployeePermission} from '../../../shared/model/employee'
+import {EntityEditComponent} from '../../../shared/components/entity-edit/entity-edit.component'
+import {ImagesEditorComponent} from '../../components/images-editor/images-editor.component'
+import {ErrorHandler, ErrorModel, ErrorService} from '../../../shared/service/error.service'
+import {AlertService} from '../../../shared/service/alert.service'
 
 @Component({
   selector: 'cre-edit',
   templateUrl: './edit.component.html',
   styleUrls: ['./edit.component.sass']
 })
-export class EditComponent extends SubscribingComponent {
+export class EditComponent extends ErrorHandlingComponent {
   readonly unitConstants = {UNIT_MILLILITER, UNIT_LITER, UNIT_GALLON}
 
   @ViewChild('imagesEditor') imagesEditor: ImagesEditorComponent
@@ -75,36 +77,41 @@ export class EditComponent extends SubscribingComponent {
       valueFn: recipe => recipe.company.name,
     }
   ]
-  unknownError = false
-  errorMessage: string | null
   units$ = new Subject<string>()
+  submittedValues: any | null
+
+  handledErrorModels: ErrorModel[] = [{
+    filter: error => error.status === 409,
+    messageProducer: () => `Une couleur avec le nom '${this.submittedValues.name}' et la bannière '${this.recipe.company.name}' existe déjà`
+  }]
 
   constructor(
     private recipeService: RecipeService,
     private accountService: AccountService,
+    private alertService: AlertService,
+    errorService: ErrorService,
     router: Router,
     activatedRoute: ActivatedRoute
   ) {
-    super(activatedRoute, router)
+    super(errorService, activatedRoute, router)
   }
 
   ngOnInit() {
-    super.ngOnInit();
+    super.ngOnInit()
 
-    const id = parseInt(this.activatedRoute.snapshot.paramMap.get('id'))
-    this.subscribe(
-      this.recipeService.getById(id),
-      {
-        next: recipe => this.recipe = recipe,
-        error: err => {
-          if (err.status === 404) {
-            this.router.navigate(['/color/list'])
-          } else {
-            this.unknownError = true
-          }
+    this.subscribeEntityById(
+      this.recipeService,
+      parseInt(this.activatedRoute.snapshot.paramMap.get('id')),
+      recipe => {
+        this.recipe = recipe
+        if (this.recipe.mixes.length == 0) {
+          this.alertService.pushWarning('Il n\'y a aucun mélange dans cette recette')
+        }
+        if (this.recipe.steps.length == 0) {
+          this.alertService.pushWarning('Il n\'y a aucune étape dans cette recette')
         }
       },
-      1
+      '/color/list'
     )
   }
 
@@ -114,28 +121,17 @@ export class EditComponent extends SubscribingComponent {
 
   submit(editComponent: EntityEditComponent) {
     const values = editComponent.values
-    this.subscribe(
+    this.submittedValues = values
+    this.subscribeAndNavigate(
       this.recipeService.update(this.recipe.id, values.name, values.description, values.sample, values.approbationDate, values.remark, this.recipe.steps),
-      {
-        next: () => this.router.navigate(['/color/list']),
-        error: err => {
-          if (err.status === 409) {
-            this.errorMessage = `Une couleur avec le nom '${values.name}' et la bannière '${this.recipe.company.name}' existe déjà`
-          } else {
-            this.unknownError = true
-            console.error(err)
-          }
-        }
-      }
+      '/color/list'
     )
   }
 
   delete() {
-    this.subscribe(
+    this.subscribeAndNavigate(
       this.recipeService.delete(this.recipe.id),
-      {
-        next: () => this.router.navigate(['/color/list'])
-      }
+      '/color/list'
     )
   }
 
diff --git a/src/app/modules/colors/pages/explore/explore.component.html b/src/app/modules/colors/pages/explore/explore.component.html
index 76cd1bb..9ee5eec 100644
--- a/src/app/modules/colors/pages/explore/explore.component.html
+++ b/src/app/modules/colors/pages/explore/explore.component.html
@@ -1,26 +1,6 @@
 <div *ngIf="recipe">
   <cre-recipe-info [recipe]="recipe" [hasModifications]="hasModifications"></cre-recipe-info>
 
-  <div *ngIf="error" class="alert alert-danger m-3">
-    <p *ngIf="error === ERROR_UNKNOWN">Une erreur est survenue</p>
-    <p *ngIf="error === ERROR_DEDUCT">Certains produit ne sont pas en quantité suffisante dans l'inventaire</p>
-  </div>
-
-  <div *ngIf="printingError != 2 && printingError != 1" class="alert alert-danger m-3">
-    <p *ngIf="printingError === -1">L'extension b-Pac n'est pas installée</p>
-    <p *ngIf="printingError === 98">Il n'y a pas de base dans ce mélange</p>
-    <p *ngIf="printingError === 99">Une erreur est survenue pendant l'impression</p>
-  </div>
-
-  <div *ngIf="success" class="alert alert-success m-3">
-    <p *ngIf="success === SUCCESS_SAVE">Les modifications ont été enregistrées</p>
-    <p *ngIf="success === SUCCESS_DEDUCT">Les quantités des produits utilisés ont été déduites de l'inventaire</p>
-  </div>
-
-  <div *ngIf="printingError === 1" class="alert alert-success m-3">
-    <p>Impression en cours. Cette opération peut prendre quelques secondes.</p>
-  </div>
-
   <div class="action-bar backward d-flex flex-row">
     <div class="d-flex flex-column">
       <div class="mt-1 pb-2">
@@ -51,8 +31,7 @@
         [units$]="units$"
         (quantityChange)="changeQuantity($event)"
         (locationChange)="changeMixLocation($event)"
-        (deduct)="deductMixQuantities($event)"
-        [(printingError)]="printingError">
+        (deduct)="deductMixQuantities($event)">
       </cre-mixes-card>
     </div>
 
diff --git a/src/app/modules/colors/pages/explore/explore.component.ts b/src/app/modules/colors/pages/explore/explore.component.ts
index 34348ba..610f44c 100644
--- a/src/app/modules/colors/pages/explore/explore.component.ts
+++ b/src/app/modules/colors/pages/explore/explore.component.ts
@@ -1,63 +1,65 @@
-import {Component} from '@angular/core';
-import {RecipeService} from "../../services/recipe.service";
-import {ActivatedRoute, Router} from "@angular/router";
-import {SubscribingComponent} from "../../../shared/components/subscribing.component";
-import {Recipe} from "../../../shared/model/recipe.model";
-import {Observable, Subject} from "rxjs";
-import {UNIT_GALLON, UNIT_LITER, UNIT_MILLILITER} from "../../../shared/units";
+import {Component} from '@angular/core'
+import {RecipeService} from '../../services/recipe.service'
+import {ActivatedRoute, Router} from '@angular/router'
+import {ErrorHandlingComponent} from '../../../shared/components/subscribing.component'
+import {Recipe} from '../../../shared/model/recipe.model'
+import {Observable, Subject} from 'rxjs'
+import {ErrorModel, ErrorService} from '../../../shared/service/error.service'
+import {AlertService} from '../../../shared/service/alert.service'
+import {GlobalAlertHandlerComponent} from '../../../shared/components/global-alert-handler/global-alert-handler.component'
 
 @Component({
   selector: 'cre-explore',
   templateUrl: './explore.component.html',
   styleUrls: ['./explore.component.sass']
 })
-export class ExploreComponent extends SubscribingComponent {
-  readonly unitConstants = {UNIT_MILLILITER, UNIT_LITER, UNIT_GALLON}
-
+export class ExploreComponent extends ErrorHandlingComponent {
   recipe: Recipe | null
-  error: string
   deductErrorBody = {}
-  success: string
   units$ = new Subject<string>()
 
   hasModifications = false
   note: string | null
   quantitiesChanges = new Map<number, Map<number, number>>()
   mixesLocationChanges = new Map<number, string>()
-  printingError = 2
 
-  // Errors
-  readonly ERROR_UNKNOWN = 'unknown'
-  readonly ERROR_DEDUCT = 'deduct'
-  // Success
-  readonly SUCCESS_SAVE = 'save'
-  readonly SUCCESS_DEDUCT = 'deduct'
+  handledErrorModels: ErrorModel[] = [{
+    filter: error => error.status === 409,
+    consumer: error => this.deductErrorBody = error.error,
+    messageProducer: () => 'Certains produit ne sont pas en quantité suffisante dans l\'inventaire'
+  }]
 
   constructor(
     private recipeService: RecipeService,
+    private alertService: AlertService,
+    errorService: ErrorService,
     router: Router,
     activatedRoute: ActivatedRoute
   ) {
-    super(activatedRoute, router)
+    super(errorService, activatedRoute, router)
   }
 
   ngOnInit(): void {
     super.ngOnInit()
+    GlobalAlertHandlerComponent.extraTopMarginMultiplier = 2.5
 
     const id = parseInt(this.activatedRoute.snapshot.paramMap.get('id'))
-    this.subscribe(
-      this.recipeService.getById(id),
-      {
-        next: r => {
-          this.recipe = r
-          this.note = r.note
-        },
-        error: err => this.handleNotFoundError(err, '/colors/list')
+    this.subscribeEntityById(
+      this.recipeService,
+      id,
+      r => {
+        this.recipe = r
+        this.note = r.note
       },
-      1
+      '/colors/list'
     )
   }
 
+  ngOnDestroy() {
+    super.ngOnDestroy();
+    GlobalAlertHandlerComponent.extraTopMarginMultiplier = 0
+  }
+
   changeUnits(unit: string) {
     this.units$.next(unit)
   }
@@ -68,7 +70,9 @@ export class ExploreComponent extends SubscribingComponent {
   }
 
   changeQuantity(event: { id: number, materialId: number, quantity: number }) {
-    if (!this.quantitiesChanges.has(event.id)) this.quantitiesChanges.set(event.id, new Map<number, number>())
+    if (!this.quantitiesChanges.has(event.id)) {
+      this.quantitiesChanges.set(event.id, new Map<number, number>())
+    }
     this.quantitiesChanges.get(event.id).set(event.materialId, event.quantity)
   }
 
@@ -80,19 +84,7 @@ export class ExploreComponent extends SubscribingComponent {
   saveModifications() {
     this.subscribe(
       this.recipeService.saveExplorerModifications(this.recipe.id, this.note, this.mixesLocationChanges),
-      {
-        next: () => {
-          this.hasModifications = false
-          this.error = null
-          this.success = this.SUCCESS_SAVE
-        },
-        error: err => {
-          this.success = null
-          this.error = this.ERROR_UNKNOWN
-          console.error(err)
-        }
-      },
-      1
+      () => this.alertService.pushSuccess('Les modifications ont été enregistrées')
     )
   }
 
@@ -107,23 +99,7 @@ export class ExploreComponent extends SubscribingComponent {
   performDeductQuantities(observable: Observable<void>) {
     this.subscribe(
       observable,
-      {
-        next: () => {
-          this.error = null
-          this.success = this.SUCCESS_DEDUCT
-        },
-        error: err => {
-          this.success = null
-          if (err.status === 409) { // There is not enough of one or more materials in the inventory
-            this.error = this.ERROR_DEDUCT
-            this.deductErrorBody = err.error
-          } else {
-            this.error = this.ERROR_UNKNOWN
-            console.error(err)
-          }
-        }
-      },
-      1
+      () => this.alertService.pushSuccess('Les quantités des produits utilisés ont été déduites de l\'inventaire')
     )
   }
 }
diff --git a/src/app/modules/colors/pages/list/list.component.ts b/src/app/modules/colors/pages/list/list.component.ts
index 1107b7e..ca2c87d 100644
--- a/src/app/modules/colors/pages/list/list.component.ts
+++ b/src/app/modules/colors/pages/list/list.component.ts
@@ -1,30 +1,34 @@
-import {Component} from '@angular/core';
-import {SubscribingComponent} from "../../../shared/components/subscribing.component";
-import {RecipeService} from "../../services/recipe.service";
-import {EmployeePermission} from "../../../shared/model/employee";
-import {AccountService} from "../../../accounts/services/account.service";
-import {Recipe} from "../../../shared/model/recipe.model";
-import {ActivatedRoute, Router} from "@angular/router";
+import {Component} from '@angular/core'
+import {ErrorHandlingComponent} from '../../../shared/components/subscribing.component'
+import {RecipeService} from '../../services/recipe.service'
+import {EmployeePermission} from '../../../shared/model/employee'
+import {AccountService} from '../../../accounts/services/account.service'
+import {Recipe} from '../../../shared/model/recipe.model'
+import {ActivatedRoute, Router} from '@angular/router'
+import {ErrorModel, ErrorService} from '../../../shared/service/error.service'
 
 @Component({
   selector: 'cre-list',
   templateUrl: './list.component.html',
   styleUrls: ['./list.component.sass']
 })
-export class ListComponent extends SubscribingComponent {
+export class ListComponent extends ErrorHandlingComponent {
   recipes$ = this.recipeService.allSortedByCompany
   tableCols = ['name', 'description', 'sample', 'iconNotApproved', 'buttonView', 'buttonEdit']
   searchQuery = ""
   panelForcedExpanded = false
   recipesHidden = []
 
+  handledErrorModels: ErrorModel[]
+
   constructor(
     private recipeService: RecipeService,
     private accountService: AccountService,
+    errorService: ErrorService,
     router: Router,
     activatedRoute: ActivatedRoute
   ) {
-    super(activatedRoute, router)
+    super(errorService, activatedRoute, router)
   }
 
   ngOnInit() {
diff --git a/src/app/modules/colors/pages/mix/mix-add/mix-add.component.ts b/src/app/modules/colors/pages/mix/mix-add/mix-add.component.ts
index ca267d1..3916658 100644
--- a/src/app/modules/colors/pages/mix/mix-add/mix-add.component.ts
+++ b/src/app/modules/colors/pages/mix/mix-add/mix-add.component.ts
@@ -1,26 +1,30 @@
-import {Component} from '@angular/core';
-import {Material} from "../../../../shared/model/material.model";
-import {MaterialService} from "../../../../material/service/material.service";
-import {ActivatedRoute, Router} from "@angular/router";
-import {SubscribingComponent} from "../../../../shared/components/subscribing.component";
-import {MixService} from "../../../services/mix.service";
+import {Component} from '@angular/core'
+import {Material} from '../../../../shared/model/material.model'
+import {MaterialService} from '../../../../material/service/material.service'
+import {ActivatedRoute, Router} from '@angular/router'
+import {ErrorHandlingComponent, SubscribingComponent} from '../../../../shared/components/subscribing.component'
+import {MixService} from '../../../services/mix.service'
+import {ErrorHandler, ErrorModel, ErrorService} from '../../../../shared/service/error.service'
 
 @Component({
   selector: 'cre-mix-add',
   templateUrl: './mix-add.component.html',
   styleUrls: ['./mix-add.component.sass']
 })
-export class MixAddComponent extends SubscribingComponent {
+export class MixAddComponent extends ErrorHandlingComponent {
   recipeId: number | null
   materials: Material[] | null
 
+  handledErrorModels: ErrorModel[]
+
   constructor(
     private materialService: MaterialService,
     private mixService: MixService,
+    errorService: ErrorService,
     router: Router,
     activatedRoute: ActivatedRoute
   ) {
-    super(activatedRoute, router)
+    super(errorService, activatedRoute, router)
   }
 
   ngOnInit(): void {
@@ -30,14 +34,14 @@ export class MixAddComponent extends SubscribingComponent {
 
     this.subscribe(
       this.materialService.getAllForMixCreation(this.recipeId),
-      {next: m => this.materials = m}
+      m => this.materials = m
     )
   }
 
   submit(values) {
-    this.subscribe(
+    this.subscribeAndNavigate(
       this.mixService.saveWithUnits(values.name, values.recipeId, values.materialTypeId, values.mixMaterials, values.units),
-      {next: () => this.urlUtils.navigateTo(`/color/edit/${this.recipeId}`)}
+      `/color/edit/${this.recipeId}`
     )
   }
 }
diff --git a/src/app/modules/colors/pages/mix/mix-edit/mix-edit.component.ts b/src/app/modules/colors/pages/mix/mix-edit/mix-edit.component.ts
index 981998d..f463f5f 100644
--- a/src/app/modules/colors/pages/mix/mix-edit/mix-edit.component.ts
+++ b/src/app/modules/colors/pages/mix/mix-edit/mix-edit.component.ts
@@ -1,27 +1,31 @@
-import {Component} from '@angular/core';
-import {ActivatedRoute, Router} from "@angular/router";
-import {SubscribingComponent} from "../../../../shared/components/subscribing.component";
-import {Material} from "../../../../shared/model/material.model";
-import {MaterialService} from "../../../../material/service/material.service";
-import {MixService} from "../../../services/mix.service";
+import {Component} from '@angular/core'
+import {ActivatedRoute, Router} from '@angular/router'
+import {ErrorHandlingComponent} from '../../../../shared/components/subscribing.component'
+import {Material} from '../../../../shared/model/material.model'
+import {MaterialService} from '../../../../material/service/material.service'
+import {MixService} from '../../../services/mix.service'
+import {ErrorModel, ErrorService} from '../../../../shared/service/error.service'
 
 @Component({
   selector: 'cre-mix-edit',
   templateUrl: './mix-edit.component.html',
   styleUrls: ['./mix-edit.component.sass']
 })
-export class MixEditComponent extends SubscribingComponent {
+export class MixEditComponent extends ErrorHandlingComponent {
   mixId: number | null
   recipeId: number | null
   materials: Material[] | null
 
+  handledErrorModels: ErrorModel[]
+
   constructor(
     private materialService: MaterialService,
     private mixService: MixService,
+    errorService: ErrorService,
     router: Router,
     activatedRoute: ActivatedRoute
   ) {
-    super(activatedRoute, router)
+    super(errorService, activatedRoute, router)
   }
 
   ngOnInit(): void {
@@ -32,14 +36,14 @@ export class MixEditComponent extends SubscribingComponent {
 
     this.subscribe(
       this.materialService.getAllForMixUpdate(this.mixId),
-      {next: m => this.materials = m}
+      m => this.materials = m
     )
   }
 
   submit(values) {
-    this.subscribe(
+    this.subscribeAndNavigate(
       this.mixService.updateWithUnits(this.mixId, values.name, values.materialTypeId, values.mixMaterials, values.units),
-      {next: () => this.urlUtils.navigateTo(`/color/edit/${this.recipeId}`)}
+      `/color/edit/${this.recipeId}`
     )
   }
 }
diff --git a/src/app/modules/company/pages/add/add.component.html b/src/app/modules/company/pages/add/add.component.html
index 75daec8..a63280a 100644
--- a/src/app/modules/company/pages/add/add.component.html
+++ b/src/app/modules/company/pages/add/add.component.html
@@ -1,8 +1,6 @@
 <cre-entity-add
   title="Création d'une bannière"
   backButtonLink="/catalog/company/list"
-  [unknownError]="unknownError"
-  [customError]="errorMessage"
   [formFields]="formFields"
   (submit)="submit($event)">
 </cre-entity-add>
diff --git a/src/app/modules/company/pages/add/add.component.ts b/src/app/modules/company/pages/add/add.component.ts
index fd0db62..0579fe3 100644
--- a/src/app/modules/company/pages/add/add.component.ts
+++ b/src/app/modules/company/pages/add/add.component.ts
@@ -1,16 +1,17 @@
-import {Component} from '@angular/core';
-import {CompanyService} from "../../service/company.service";
-import {FormBuilder, Validators} from "@angular/forms";
-import {SubscribingComponent} from "../../../shared/components/subscribing.component";
-import {FormField} from "../../../shared/components/entity-add/entity-add.component";
-import {ActivatedRoute, Router} from "@angular/router";
+import {Component} from '@angular/core'
+import {CompanyService} from '../../service/company.service'
+import {Validators} from '@angular/forms'
+import {ErrorHandlingComponent} from '../../../shared/components/subscribing.component'
+import {FormField} from '../../../shared/components/entity-add/entity-add.component'
+import {ActivatedRoute, Router} from '@angular/router'
+import {ErrorModel, ErrorService} from '../../../shared/service/error.service'
 
 @Component({
   selector: 'cre-add',
   templateUrl: './add.component.html',
   styleUrls: ['./add.component.sass']
 })
-export class AddComponent extends SubscribingComponent {
+export class AddComponent extends ErrorHandlingComponent {
   formFields: FormField[] = [
     {
       name: 'name',
@@ -23,31 +24,31 @@ export class AddComponent extends SubscribingComponent {
       ]
     }
   ]
-  unknownError = false
-  errorMessage: string | null
+  submittedValues: any | null
+
+  handledErrorModels: ErrorModel[] = [{
+    filter: error => error.status === 409,
+    messageProducer: () => `Une bannière avec le nom '${this.submittedValues.name}' existe déjà`
+  }]
 
   constructor(
     private companyService: CompanyService,
+    errorService: ErrorService,
     router: Router,
     activatedRoute: ActivatedRoute
   ) {
-    super(activatedRoute, router)
+    super(errorService, activatedRoute, router)
+  }
+
+  ngOnInit() {
+    super.ngOnInit()
   }
 
   submit(values) {
-    this.subscribe(
+    this.submittedValues = values
+    this.subscribeAndNavigate(
       this.companyService.save(values.name),
-      {
-        next: () => this.router.navigate(['/catalog/company/list']),
-        error: err => {
-          if (err.status === 409) {
-            this.errorMessage = `Une bannière avec le nom '${values.name}' existe déjà`
-          } else {
-            this.unknownError = true
-            console.log(err)
-          }
-        }
-      }
+      '/catalog/company/list'
     )
   }
 }
diff --git a/src/app/modules/company/pages/edit/edit.component.html b/src/app/modules/company/pages/edit/edit.component.html
index d3211cd..04864a7 100644
--- a/src/app/modules/company/pages/edit/edit.component.html
+++ b/src/app/modules/company/pages/edit/edit.component.html
@@ -6,8 +6,6 @@
   deletePermission="REMOVE_COMPANY"
   [entity]="company"
   [formFields]="formFields"
-  [unknownError]="unknownError"
-  [customError]="errorMessage"
   (submit)="submit($event)"
   (delete)="delete()">
 </cre-entity-edit>
diff --git a/src/app/modules/company/pages/edit/edit.component.ts b/src/app/modules/company/pages/edit/edit.component.ts
index b828812..af7ebbf 100644
--- a/src/app/modules/company/pages/edit/edit.component.ts
+++ b/src/app/modules/company/pages/edit/edit.component.ts
@@ -1,17 +1,18 @@
-import {Component} from '@angular/core';
-import {SubscribingComponent} from "../../../shared/components/subscribing.component";
-import {Company} from "../../../shared/model/company.model";
-import {FormField} from "../../../shared/components/entity-add/entity-add.component";
-import {FormBuilder, Validators} from "@angular/forms";
-import {CompanyService} from "../../service/company.service";
-import {ActivatedRoute, Router} from "@angular/router";
+import {Component} from '@angular/core'
+import {ErrorHandlingComponent} from '../../../shared/components/subscribing.component'
+import {Company} from '../../../shared/model/company.model'
+import {FormField} from '../../../shared/components/entity-add/entity-add.component'
+import {Validators} from '@angular/forms'
+import {CompanyService} from '../../service/company.service'
+import {ActivatedRoute, Router} from '@angular/router'
+import {ErrorModel, ErrorService} from '../../../shared/service/error.service'
 
 @Component({
   selector: 'cre-edit',
   templateUrl: './edit.component.html',
   styleUrls: ['./edit.component.sass']
 })
-export class EditComponent extends SubscribingComponent {
+export class EditComponent extends ErrorHandlingComponent {
   company: Company | null
   formFields: FormField[] = [
     {
@@ -25,64 +26,44 @@ export class EditComponent extends SubscribingComponent {
       ]
     }
   ]
-  unknownError = false
-  errorMessage: string | null
+
+  handledErrorModels: ErrorModel[] = [{
+    filter: error => error.status === 409,
+    messageProducer: error => `Une bannière avec le nom '${error.error.id}' existe déjà`
+  }]
 
   constructor(
     private companyService: CompanyService,
+    errorService: ErrorService,
     router: Router,
     activatedRoute: ActivatedRoute
   ) {
-    super(activatedRoute, router)
+    super(errorService, activatedRoute, router)
   }
 
   ngOnInit(): void {
     super.ngOnInit()
 
     const id = parseInt(this.activatedRoute.snapshot.paramMap.get('id'))
-    this.subscribe(
-      this.companyService.getById(id),
-      {
-        next: company => this.company = company,
-        error: err => {
-          if (err.status == 404) {
-            this.router.navigate(['/catalog/company/list'])
-          } else {
-            this.unknownError = true
-          }
-        }
-      },
-      1
+    this.subscribeEntityById(
+      this.companyService,
+      id,
+      company => this.company = company,
+      '/catalog/company/list'
     )
   }
 
   submit(values) {
-    this.subscribe(
+    this.subscribeAndNavigate(
       this.companyService.update(this.company.id, values.name),
-      {
-        next: () => this.router.navigate(['/catalog/company/list']),
-        error: err => {
-          if (err.status == 409) {
-            this.errorMessage = `Une bannière avec le nom '${values.name}' existe déjà`
-          } else {
-            this.unknownError = true
-          }
-          console.log(err)
-        }
-      }
+      '/catalog/company/list'
     )
   }
 
   delete() {
-    this.subscribe(
+    this.subscribeAndNavigate(
       this.companyService.delete(this.company.id),
-      {
-        next: () => this.router.navigate(['/catalog/company/list']),
-        error: err => {
-          this.unknownError = true
-          console.log(err)
-        }
-      }
+      '/catalog/company/list'
     )
   }
 }
diff --git a/src/app/modules/company/pages/list/list.component.ts b/src/app/modules/company/pages/list/list.component.ts
index 83c85f0..7f7a88d 100644
--- a/src/app/modules/company/pages/list/list.component.ts
+++ b/src/app/modules/company/pages/list/list.component.ts
@@ -1,16 +1,16 @@
-import {Component} from '@angular/core';
-import {SubscribingComponent} from "../../../shared/components/subscribing.component";
-import {CompanyService} from "../../service/company.service";
-import {EmployeePermission} from "../../../shared/model/employee";
-import {FormBuilder} from "@angular/forms";
-import {ActivatedRoute, Router} from "@angular/router";
+import {Component} from '@angular/core'
+import {ErrorHandlingComponent} from '../../../shared/components/subscribing.component'
+import {CompanyService} from '../../service/company.service'
+import {EmployeePermission} from '../../../shared/model/employee'
+import {ActivatedRoute, Router} from '@angular/router'
+import {ErrorService} from '../../../shared/service/error.service'
 
 @Component({
   selector: 'cre-list',
   templateUrl: './list.component.html',
   styleUrls: ['./list.component.sass']
 })
-export class ListComponent extends SubscribingComponent {
+export class ListComponent extends ErrorHandlingComponent {
   companies$ = this.companyService.all
   columns = [
     {def: 'name', title: 'Nom', valueFn: c => c.name}
@@ -23,9 +23,10 @@ export class ListComponent extends SubscribingComponent {
 
   constructor(
     private companyService: CompanyService,
+    errorService: ErrorService,
     router: Router,
     activatedRoute: ActivatedRoute
   ) {
-    super(activatedRoute, router)
+    super(errorService, activatedRoute, router)
   }
 }
diff --git a/src/app/modules/employees/pages/add/add.component.html b/src/app/modules/employees/pages/add/add.component.html
index 69f1ebe..951e943 100644
--- a/src/app/modules/employees/pages/add/add.component.html
+++ b/src/app/modules/employees/pages/add/add.component.html
@@ -3,10 +3,6 @@
     <mat-card-title>Création d'un employé</mat-card-title>
   </mat-card-header>
   <mat-card-content>
-    <div *ngIf="unknownError" class="alert alert-danger">
-      <p>Une erreur est survenue</p>
-    </div>
-
     <form [formGroup]="form">
       <mat-form-field>
         <mat-label>Numéro d'employé</mat-label>
diff --git a/src/app/modules/employees/pages/add/add.component.ts b/src/app/modules/employees/pages/add/add.component.ts
index 3e8cc51..a11377a 100644
--- a/src/app/modules/employees/pages/add/add.component.ts
+++ b/src/app/modules/employees/pages/add/add.component.ts
@@ -1,20 +1,20 @@
-import {Component, OnDestroy, OnInit, ViewChild} from '@angular/core';
-import {FormBuilder, FormControl, FormGroup, Validators} from "@angular/forms";
-import {PermissionsFieldComponent} from "../../../shared/components/permissions-field/permissions-field.component";
-import {EmployeeGroup} from "../../../shared/model/employee";
-import {Observable, Subject} from "rxjs";
-import {GroupService} from "../../../groups/services/group.service";
-import {take, takeUntil} from "rxjs/operators";
-import {EmployeeService} from "../../services/employee.service";
-import {ActivatedRoute, Router} from "@angular/router";
-import {SubscribingComponent} from "../../../shared/components/subscribing.component";
+import {Component, ViewChild} from '@angular/core'
+import {FormControl, FormGroup, Validators} from '@angular/forms'
+import {PermissionsFieldComponent} from '../../../shared/components/permissions-field/permissions-field.component'
+import {EmployeeGroup} from '../../../shared/model/employee'
+import {Observable} from 'rxjs'
+import {GroupService} from '../../../groups/services/group.service'
+import {EmployeeService} from '../../services/employee.service'
+import {ActivatedRoute, Router} from '@angular/router'
+import {ErrorHandlingComponent} from '../../../shared/components/subscribing.component'
+import {ErrorService} from '../../../shared/service/error.service'
 
 @Component({
   selector: 'cre-add',
   templateUrl: './add.component.html',
   styleUrls: ['./add.component.sass']
 })
-export class AddComponent extends SubscribingComponent {
+export class AddComponent extends ErrorHandlingComponent {
   @ViewChild('permissionsField', {static: true}) permissionsField: PermissionsFieldComponent
 
   form: FormGroup
@@ -23,17 +23,17 @@ export class AddComponent extends SubscribingComponent {
   lastNameControl: FormControl
   passwordControl: FormControl
   groupControl: FormControl
-  unknownError = false
 
   group$: Observable<EmployeeGroup[]> | null
 
   constructor(
     private employeeService: EmployeeService,
     private groupService: GroupService,
+    errorService: ErrorService,
     router: Router,
     activatedRoute: ActivatedRoute
   ) {
-    super(activatedRoute, router)
+    super(errorService, activatedRoute, router)
   }
 
   ngOnInit(): void {
@@ -57,7 +57,7 @@ export class AddComponent extends SubscribingComponent {
 
   submit() {
     if (this.permissionsField.valid() && this.form.valid) {
-      this.subscribe(
+      this.subscribeAndNavigate(
         this.employeeService.save(
           parseInt(this.idControl.value),
           this.firstNameControl.value,
@@ -66,13 +66,7 @@ export class AddComponent extends SubscribingComponent {
           this.groupControl.value,
           this.permissionsField.allEnabledPermissions
         ),
-        {
-          next: () => this.router.navigate(['/employee/list']),
-          error: err => {
-            console.error(err)
-            this.unknownError = true
-          }
-        }
+        '/employee/list'
       )
     }
   }
diff --git a/src/app/modules/employees/pages/edit/edit.component.html b/src/app/modules/employees/pages/edit/edit.component.html
index 4aa184b..73bc07f 100644
--- a/src/app/modules/employees/pages/edit/edit.component.html
+++ b/src/app/modules/employees/pages/edit/edit.component.html
@@ -3,10 +3,6 @@
     <mat-card-title>Modification de l'employé #{{employee.id}}</mat-card-title>
   </mat-card-header>
   <mat-card-content>
-    <div *ngIf="unknownError" class="alert alert-danger">
-      <p>Une erreur est survenue</p>
-    </div>
-
     <form [formGroup]="form">
       <mat-form-field>
         <mat-label>Numéro d'employé</mat-label>
diff --git a/src/app/modules/employees/pages/edit/edit.component.ts b/src/app/modules/employees/pages/edit/edit.component.ts
index 6199b9c..ad45c80 100644
--- a/src/app/modules/employees/pages/edit/edit.component.ts
+++ b/src/app/modules/employees/pages/edit/edit.component.ts
@@ -1,22 +1,22 @@
-import {Component} from '@angular/core';
-import {PermissionsFieldComponent} from "../../../shared/components/permissions-field/permissions-field.component";
-import {FormBuilder, FormControl, FormGroup, Validators} from "@angular/forms";
-import {EmployeeService} from "../../services/employee.service";
-import {GroupService} from "../../../groups/services/group.service";
-import {ActivatedRoute, Router} from "@angular/router";
-import {Observable} from "rxjs";
-import {Employee, EmployeeGroup, EmployeePermission} from "../../../shared/model/employee";
-import {AccountService} from "../../../accounts/services/account.service";
-import {SubscribingComponent} from "../../../shared/components/subscribing.component";
+import {Component} from '@angular/core'
+import {PermissionsFieldComponent} from '../../../shared/components/permissions-field/permissions-field.component'
+import {FormBuilder, FormControl, FormGroup, Validators} from '@angular/forms'
+import {EmployeeService} from '../../services/employee.service'
+import {GroupService} from '../../../groups/services/group.service'
+import {ActivatedRoute, Router} from '@angular/router'
+import {Observable} from 'rxjs'
+import {Employee, EmployeeGroup, EmployeePermission} from '../../../shared/model/employee'
+import {AccountService} from '../../../accounts/services/account.service'
+import {ErrorHandlingComponent} from '../../../shared/components/subscribing.component'
+import {ErrorService} from '../../../shared/service/error.service'
 
 @Component({
   selector: 'cre-edit',
   templateUrl: './edit.component.html',
   styleUrls: ['./edit.component.sass']
 })
-export class EditComponent extends SubscribingComponent {
+export class EditComponent extends ErrorHandlingComponent {
   employee: Employee | null
-  unknownError = false
 
   group$: Observable<EmployeeGroup[]> | null
 
@@ -30,27 +30,20 @@ export class EditComponent extends SubscribingComponent {
     private employeeService: EmployeeService,
     private groupService: GroupService,
     private formBuilder: FormBuilder,
+    errorService: ErrorService,
     router: Router,
     activatedRoute: ActivatedRoute
   ) {
-    super(activatedRoute, router)
+    super(errorService, activatedRoute, router)
   }
 
   ngOnInit(): void {
-    const employeeId = this.activatedRoute.snapshot.paramMap.get("id")
-    this.subscribe(
-      this.employeeService.get(parseInt(employeeId)),
-      {
-        next: employee => this.employee = employee,
-        error: err => {
-          if (err.status === 404) {
-            this.router.navigate(['/employee/list'])
-          } else {
-            this.unknownError = true
-          }
-        }
-      },
-      1
+    const id = parseInt(this.activatedRoute.snapshot.paramMap.get('id'))
+    this.subscribeEntityById(
+      this.employeeService,
+      id,
+      employee => this.employee = employee,
+      '/employee/list'
     )
 
     this.group$ = this.groupService.all
@@ -65,40 +58,22 @@ export class EditComponent extends SubscribingComponent {
           this.lastNameControl.value,
           permissionsField.allEnabledPermissions
         ),
-        {
-          next: () => {
-            const group = parseInt(this._groupControl.value)
-            if (!isNaN(group)) {
-              this.subscribe(
-                this.groupService.addEmployeeToGroup(group, this.employee),
-                {
-                  next: () => this.router.navigate(['/employee/list']),
-                  error: err => {
-                    console.error(err)
-                    this.unknownError = true
-                  }
-                }
+        () => {
+          const group = parseInt(this._groupControl.value)
+          if (!isNaN(group)) {
+            this.subscribeAndNavigate(
+              this.groupService.addEmployeeToGroup(group, this.employee),
+              '/employee/list'
+            )
+          } else {
+            if (this.employee.group) {
+              this.subscribeAndNavigate(
+                this.groupService.removeEmployeeFromGroup(this.employee),
+                '/employee/list'
               )
             } else {
-              if (this.employee.group) {
-                this.subscribe(
-                  this.groupService.removeEmployeeFromGroup(this.employee),
-                  {
-                    next: () => this.router.navigate(['/employee/list']),
-                    error: err => {
-                      console.error(err)
-                      this.unknownError = true
-                    }
-                  }
-                )
-              } else {
-                this.router.navigate(['/employee/list'])
-              }
+              this.router.navigate(['/employee/list'])
             }
-          },
-          error: err => {
-            console.error(err)
-            this.unknownError = true
           }
         }
       )
@@ -106,15 +81,9 @@ export class EditComponent extends SubscribingComponent {
   }
 
   delete() {
-    this.subscribe(
+    this.subscribeAndNavigate(
       this.employeeService.delete(this.employee.id),
-      {
-        next: () => this.router.navigate(['/employee/list']),
-        error: err => {
-          this.unknownError = true
-          console.error(err)
-        }
-      }
+      '/employee/list'
     )
   }
 
@@ -148,7 +117,9 @@ export class EditComponent extends SubscribingComponent {
   }
 
   private lazyControl(control: FormControl, provider: () => FormControl): FormControl {
-    if (control) return control
+    if (control) {
+      return control
+    }
     if (this.employee) {
       return provider()
     }
diff --git a/src/app/modules/employees/pages/list/list.component.ts b/src/app/modules/employees/pages/list/list.component.ts
index f5c6f02..6805ea6 100644
--- a/src/app/modules/employees/pages/list/list.component.ts
+++ b/src/app/modules/employees/pages/list/list.component.ts
@@ -1,13 +1,13 @@
-import {Component} from '@angular/core';
-import {Observable} from "rxjs";
-import {EmployeeService} from "../../services/employee.service";
-import {Employee, EmployeePermission} from "../../../shared/model/employee";
-import {takeUntil} from "rxjs/operators";
-import {AccountService} from "../../../accounts/services/account.service";
-import {animate, state, style, transition, trigger} from "@angular/animations";
-import {SubscribingComponent} from "../../../shared/components/subscribing.component";
-import {FormBuilder} from "@angular/forms";
-import {ActivatedRoute, Router} from "@angular/router";
+import {Component} from '@angular/core'
+import {Observable} from 'rxjs'
+import {EmployeeService} from '../../services/employee.service'
+import {Employee, EmployeePermission} from '../../../shared/model/employee'
+import {takeUntil} from 'rxjs/operators'
+import {AccountService} from '../../../accounts/services/account.service'
+import {animate, state, style, transition, trigger} from '@angular/animations'
+import {ErrorHandlingComponent} from '../../../shared/components/subscribing.component'
+import {ActivatedRoute, Router} from '@angular/router'
+import {ErrorService} from '../../../shared/service/error.service'
 
 @Component({
   selector: 'cre-employees',
@@ -21,7 +21,7 @@ import {ActivatedRoute, Router} from "@angular/router";
     ])
   ]
 })
-export class ListComponent extends SubscribingComponent {
+export class ListComponent extends ErrorHandlingComponent {
   employees$: Observable<Employee[]>
   columns = ['id', 'name', 'group', 'permissionCount', 'lastLogin', 'editButton', 'editPasswordButton']
 
@@ -30,10 +30,11 @@ export class ListComponent extends SubscribingComponent {
   constructor(
     private employeeService: EmployeeService,
     private accountService: AccountService,
+    errorService: ErrorService,
     router: Router,
     activatedRoute: ActivatedRoute
   ) {
-    super(activatedRoute, router)
+    super(errorService, activatedRoute, router)
   }
 
   ngOnInit(): void {
diff --git a/src/app/modules/employees/pages/password-edit/password-edit.component.ts b/src/app/modules/employees/pages/password-edit/password-edit.component.ts
index eda5cc9..0be7343 100644
--- a/src/app/modules/employees/pages/password-edit/password-edit.component.ts
+++ b/src/app/modules/employees/pages/password-edit/password-edit.component.ts
@@ -1,16 +1,17 @@
-import {Component} from '@angular/core';
-import {SubscribingComponent} from "../../../shared/components/subscribing.component";
-import {EmployeeService} from "../../services/employee.service";
-import {Employee} from "../../../shared/model/employee";
-import {ActivatedRoute, Router} from "@angular/router";
-import {FormBuilder, FormControl, FormGroup, Validators} from "@angular/forms";
+import {Component} from '@angular/core'
+import {ErrorHandlingComponent} from '../../../shared/components/subscribing.component'
+import {EmployeeService} from '../../services/employee.service'
+import {Employee} from '../../../shared/model/employee'
+import {ActivatedRoute, Router} from '@angular/router'
+import {FormBuilder, FormControl, FormGroup, Validators} from '@angular/forms'
+import {ErrorService} from '../../../shared/service/error.service'
 
 @Component({
   selector: 'cre-password-edit',
   templateUrl: './password-edit.component.html',
   styleUrls: ['./password-edit.component.sass']
 })
-export class PasswordEditComponent extends SubscribingComponent {
+export class PasswordEditComponent extends ErrorHandlingComponent {
   employee: Employee | null
 
   form: FormGroup
@@ -19,19 +20,20 @@ export class PasswordEditComponent extends SubscribingComponent {
   constructor(
     private employeeService: EmployeeService,
     private formBuilder: FormBuilder,
+    errorService: ErrorService,
     router: Router,
     activatedRoute: ActivatedRoute
   ) {
-    super(activatedRoute, router)
+    super(errorService, activatedRoute, router)
   }
 
   ngOnInit(): void {
-    const employeeId = this.activatedRoute.snapshot.paramMap.get('id')
-    this.subscribe(
-      this.employeeService.get(parseInt(employeeId)),
-      {
-        next: employee => this.employee = employee
-      }
+    const id = parseInt(this.activatedRoute.snapshot.paramMap.get('id'))
+    this.subscribeEntityById(
+      this.employeeService,
+      id,
+      employee => this.employee = employee,
+      '/employee/list'
     )
 
     this.form = this.formBuilder.group({
@@ -41,11 +43,9 @@ export class PasswordEditComponent extends SubscribingComponent {
 
   submit() {
     if (this.form.valid) {
-      this.subscribe(
+      this.subscribeAndNavigate(
         this.employeeService.updatePassword(this.employee.id, this.passwordControl.value),
-        {
-          next: () => this.router.navigate(['/employee/list'])
-        }
+        '/employee/list'
       )
     }
   }
diff --git a/src/app/modules/employees/services/employee.service.ts b/src/app/modules/employees/services/employee.service.ts
index 57660fb..1303068 100644
--- a/src/app/modules/employees/services/employee.service.ts
+++ b/src/app/modules/employees/services/employee.service.ts
@@ -16,7 +16,7 @@ export class EmployeeService {
     return this.api.get<Employee[]>('/employee')
   }
 
-  get(id: number): Observable<Employee> {
+  getById(id: number): Observable<Employee> {
     return this.api.get<Employee>(`/employee/${id}`)
   }
 
diff --git a/src/app/modules/groups/components/employees-list/employees-list.component.ts b/src/app/modules/groups/components/employees-list/employees-list.component.ts
index d9133f0..d99d8bc 100644
--- a/src/app/modules/groups/components/employees-list/employees-list.component.ts
+++ b/src/app/modules/groups/components/employees-list/employees-list.component.ts
@@ -1,22 +1,20 @@
-import {Component, Input, OnDestroy, OnInit} from '@angular/core';
-import {Employee, EmployeeGroup, EmployeePermission} from "../../../shared/model/employee";
-import {GroupService} from "../../services/group.service";
-import {Observable, Subject} from "rxjs";
-import {takeUntil} from "rxjs/operators";
-import {AccountService} from "../../../accounts/services/account.service";
+import {Component, Input, OnInit} from '@angular/core'
+import {Employee, EmployeeGroup, EmployeePermission} from '../../../shared/model/employee'
+import {GroupService} from '../../services/group.service'
+import {AccountService} from '../../../accounts/services/account.service'
+import {Observable} from 'rxjs'
 
 @Component({
   selector: 'cre-employees-list',
   templateUrl: './employees-list.component.html',
   styleUrls: ['./employees-list.component.sass']
 })
-export class EmployeesListComponent implements OnInit, OnDestroy {
+export class EmployeesListComponent implements OnInit {
   @Input() group: EmployeeGroup
+
   employees$: Observable<Employee[]> | null
   columns = ['id', 'firstName', 'lastName', 'edit']
 
-  private _destroy$ = new Subject<boolean>()
-
   constructor(
     private accountService: AccountService,
     private groupService: GroupService
@@ -24,12 +22,7 @@ export class EmployeesListComponent implements OnInit, OnDestroy {
   }
 
   ngOnInit(): void {
-    this.employees$ = this.groupService.getEmployeesForGroup(this.group.id).pipe(takeUntil(this._destroy$))
-  }
-
-  ngOnDestroy(): void {
-    this._destroy$.next(true)
-    this._destroy$.complete()
+    this.employees$ = this.groupService.getEmployeesForGroup(this.group.id)
   }
 
   get canEditEmployee(): boolean {
diff --git a/src/app/modules/groups/pages/add/add.component.html b/src/app/modules/groups/pages/add/add.component.html
index 37169fb..b00be66 100644
--- a/src/app/modules/groups/pages/add/add.component.html
+++ b/src/app/modules/groups/pages/add/add.component.html
@@ -3,10 +3,6 @@
     <mat-card-title>Création d'un groupe</mat-card-title>
   </mat-card-header>
   <mat-card-content>
-    <div *ngIf="unknownError" class="alert alert-danger">
-      <p>Une erreur est survenue</p>
-    </div>
-
     <form [formGroup]="form">
       <mat-form-field class="pb-3">
         <mat-label>Nom</mat-label>
diff --git a/src/app/modules/groups/pages/add/add.component.ts b/src/app/modules/groups/pages/add/add.component.ts
index efa8da0..a1a30a6 100644
--- a/src/app/modules/groups/pages/add/add.component.ts
+++ b/src/app/modules/groups/pages/add/add.component.ts
@@ -1,29 +1,30 @@
-import {Component, ViewChild} from '@angular/core';
-import {FormBuilder, FormControl, FormGroup, Validators} from "@angular/forms";
-import {GroupService} from "../../services/group.service";
-import {ActivatedRoute, Router} from "@angular/router";
-import {PermissionsFieldComponent} from "../../../shared/components/permissions-field/permissions-field.component";
-import {SubscribingComponent} from "../../../shared/components/subscribing.component";
+import {Component, ViewChild} from '@angular/core'
+import {FormBuilder, FormControl, FormGroup, Validators} from '@angular/forms'
+import {GroupService} from '../../services/group.service'
+import {ActivatedRoute, Router} from '@angular/router'
+import {PermissionsFieldComponent} from '../../../shared/components/permissions-field/permissions-field.component'
+import {ErrorHandlingComponent} from '../../../shared/components/subscribing.component'
+import {ErrorService} from '../../../shared/service/error.service'
 
 @Component({
   selector: 'cre-add',
   templateUrl: './add.component.html',
   styleUrls: ['./add.component.sass']
 })
-export class AddComponent extends SubscribingComponent {
+export class AddComponent extends ErrorHandlingComponent {
   @ViewChild('permissionsField', {static: true}) permissionsField: PermissionsFieldComponent
 
   form: FormGroup
   nameControl: FormControl
-  unknownError = false
 
   constructor(
     private formBuilder: FormBuilder,
     private groupService: GroupService,
+    errorService: ErrorService,
     router: Router,
     activatedRoute: ActivatedRoute
   ) {
-    super(activatedRoute, router)
+    super(errorService, activatedRoute, router)
   }
 
   ngOnInit(): void {
@@ -35,15 +36,9 @@ export class AddComponent extends SubscribingComponent {
 
   submit() {
     if (this.form.valid && this.permissionsField.valid()) {
-      this.subscribe(
+      this.subscribeAndNavigate(
         this.groupService.save(this.nameControl.value, this.permissionsField.allEnabledPermissions),
-        {
-          next: () => this.router.navigate(['/group/list']),
-          error: err => {
-            this.unknownError = true
-            console.log(err)
-          }
-        }
+        '/group/list'
       )
     }
   }
diff --git a/src/app/modules/groups/pages/edit/edit.component.html b/src/app/modules/groups/pages/edit/edit.component.html
index 2f45204..5d99d8b 100644
--- a/src/app/modules/groups/pages/edit/edit.component.html
+++ b/src/app/modules/groups/pages/edit/edit.component.html
@@ -3,10 +3,6 @@
     <mat-card-title>Modifier le groupe {{group.name}}</mat-card-title>
   </mat-card-header>
   <mat-card-content>
-    <div *ngIf="unknownError" class="alert alert-danger">
-      <p>Une erreur est survenue</p>
-    </div>
-
     <form [formGroup]="form">
       <mat-form-field>
         <mat-label>Nom</mat-label>
diff --git a/src/app/modules/groups/pages/edit/edit.component.ts b/src/app/modules/groups/pages/edit/edit.component.ts
index 0ef4658..f629334 100644
--- a/src/app/modules/groups/pages/edit/edit.component.ts
+++ b/src/app/modules/groups/pages/edit/edit.component.ts
@@ -1,22 +1,22 @@
-import {Component, ViewChild} from '@angular/core';
-import {ActivatedRoute, Router} from "@angular/router";
-import {EmployeeGroup, EmployeePermission} from "../../../shared/model/employee";
-import {GroupService} from "../../services/group.service";
-import {FormBuilder, FormControl, FormGroup, Validators} from "@angular/forms";
-import {PermissionsFieldComponent} from "../../../shared/components/permissions-field/permissions-field.component";
-import {AccountService} from "../../../accounts/services/account.service";
-import {SubscribingComponent} from "../../../shared/components/subscribing.component";
+import {Component, ViewChild} from '@angular/core'
+import {ActivatedRoute, Router} from '@angular/router'
+import {EmployeeGroup, EmployeePermission} from '../../../shared/model/employee'
+import {GroupService} from '../../services/group.service'
+import {FormBuilder, FormControl, FormGroup, Validators} from '@angular/forms'
+import {PermissionsFieldComponent} from '../../../shared/components/permissions-field/permissions-field.component'
+import {AccountService} from '../../../accounts/services/account.service'
+import {ErrorHandlingComponent} from '../../../shared/components/subscribing.component'
+import {ErrorService} from '../../../shared/service/error.service'
 
 @Component({
   selector: 'cre-edit',
   templateUrl: './edit.component.html',
   styleUrls: ['./edit.component.sass']
 })
-export class EditComponent extends SubscribingComponent {
+export class EditComponent extends ErrorHandlingComponent {
   @ViewChild('permissionsField') permissionsField: PermissionsFieldComponent
 
   group: EmployeeGroup | null
-  unknownError = false
 
   private _nameControl: FormControl
 
@@ -24,54 +24,36 @@ export class EditComponent extends SubscribingComponent {
     private accountService: AccountService,
     private groupService: GroupService,
     private formBuilder: FormBuilder,
+    errorService: ErrorService,
     router: Router,
     activatedRoute: ActivatedRoute
   ) {
-    super(activatedRoute, router)
+    super(errorService, activatedRoute, router)
   }
 
   ngOnInit(): void {
-    const groupId = this.activatedRoute.snapshot.paramMap.get("id")
-    this.subscribe(
-      this.groupService.get(parseInt(groupId)),
-      {
-        next: group => this.group = group,
-        error: err => {
-          if (err.status === 404) {
-            this.router.navigate(['/group/list'])
-          } else {
-            this.unknownError = true
-          }
-        }
-      }
+    const id = parseInt(this.activatedRoute.snapshot.paramMap.get('id'))
+    this.subscribeEntityById(
+      this.groupService,
+      id,
+      group => this.group = group,
+      '/group/list'
     )
   }
 
   submit(): void {
     if (this.form.valid && this.permissionsField.valid()) {
-      this.subscribe(
+      this.subscribeAndNavigate(
         this.groupService.update(this.group.id, this.nameControl.value, this.permissionsField.allEnabledPermissions),
-        {
-          next: () => this.router.navigate(['/group/list']),
-          error: err => {
-            this.unknownError = true
-            console.log(err)
-          }
-        }
+        '/group/list'
       )
     }
   }
 
   delete() {
-    this.subscribe(
+    this.subscribeAndNavigate(
       this.groupService.delete(this.group.id),
-      {
-        next: () => this.router.navigate(['/group/list']),
-        error: err => {
-          this.unknownError = true
-          console.log(err)
-        }
-      }
+      '/group/list'
     )
   }
 
@@ -86,7 +68,9 @@ export class EditComponent extends SubscribingComponent {
   }
 
   get nameControl(): FormControl {
-    if (this._nameControl) return this._nameControl
+    if (this._nameControl) {
+      return this._nameControl
+    }
     if (this.group) {
       this._nameControl = new FormControl(this.group.name, Validators.compose([Validators.required, Validators.minLength(3)]))
       return this._nameControl
diff --git a/src/app/modules/groups/pages/list/list.component.ts b/src/app/modules/groups/pages/list/list.component.ts
index 822c9d0..e6e1565 100644
--- a/src/app/modules/groups/pages/list/list.component.ts
+++ b/src/app/modules/groups/pages/list/list.component.ts
@@ -1,13 +1,14 @@
-import {Component} from '@angular/core';
-import {Observable} from "rxjs";
-import {GroupService} from "../../services/group.service";
-import {EmployeeGroup, EmployeePermission} from "../../../shared/model/employee";
-import {takeUntil} from "rxjs/operators";
-import {animate, state, style, transition, trigger} from "@angular/animations";
-import {AccountService} from "../../../accounts/services/account.service";
-import {SubscribingComponent} from "../../../shared/components/subscribing.component";
-import {FormBuilder} from "@angular/forms";
-import {ActivatedRoute, Router} from "@angular/router";
+import {Component} from '@angular/core'
+import {Observable} from 'rxjs'
+import {GroupService} from '../../services/group.service'
+import {EmployeeGroup, EmployeePermission} from '../../../shared/model/employee'
+import {takeUntil} from 'rxjs/operators'
+import {animate, state, style, transition, trigger} from '@angular/animations'
+import {AccountService} from '../../../accounts/services/account.service'
+import {ErrorHandlingComponent} from '../../../shared/components/subscribing.component'
+import {ActivatedRoute, Router} from '@angular/router'
+import {ErrorModel, ErrorService} from '../../../shared/service/error.service'
+import {AlertService} from '../../../shared/service/alert.service'
 
 @Component({
   selector: 'cre-groups',
@@ -21,40 +22,40 @@ import {ActivatedRoute, Router} from "@angular/router";
     ])
   ]
 })
-export class ListComponent extends SubscribingComponent {
+export class ListComponent extends ErrorHandlingComponent {
   groups$: Observable<EmployeeGroup[]>
   defaultGroup: EmployeeGroup = null
   columns = ['name', 'permissionCount', 'employeeCount', 'defaultGroup', 'editGroup']
   expandedElement: EmployeeGroup | null
 
+  handledErrorModels: ErrorModel[] = [{
+    filter: error => error.status === 404,
+    consumer: () => this.alertService.pushWarning('Aucun groupe par défaut n\'a été défini sur cet ordinateur')
+  }]
+
   constructor(
     private groupService: GroupService,
     private accountService: AccountService,
+    private alertService: AlertService,
+    errorService: ErrorService,
     router: Router,
     activatedRoute: ActivatedRoute
   ) {
-    super(activatedRoute, router)
+    super(errorService, activatedRoute, router)
   }
 
   ngOnInit(): void {
     this.groups$ = this.groupService.all.pipe(takeUntil(this.destroy$))
     this.subscribe(
       this.groupService.defaultGroup,
-      {
-        next: g => this.defaultGroup = g,
-        error: err => {
-          if (err.status === 404) {
-            console.error('No default group is defined on this computer')
-          }
-        }
-      }
+      group => this.defaultGroup = group,
     )
   }
 
   setDefaultGroup(group: EmployeeGroup) {
     this.subscribe(
       this.groupService.setDefaultGroup(group),
-      {next: () => this.defaultGroup = group}
+      () => this.defaultGroup = group
     )
   }
 
diff --git a/src/app/modules/groups/services/group.service.ts b/src/app/modules/groups/services/group.service.ts
index 81b0fc4..7e67017 100644
--- a/src/app/modules/groups/services/group.service.ts
+++ b/src/app/modules/groups/services/group.service.ts
@@ -16,7 +16,7 @@ export class GroupService {
     return this.api.get<EmployeeGroup[]>('/employee/group')
   }
 
-  get(id: number): Observable<EmployeeGroup> {
+  getById(id: number): Observable<EmployeeGroup> {
     return this.api.get<EmployeeGroup>(`/employee/group/${id}`);
   }
 
diff --git a/src/app/modules/material-type/pages/add/add.component.html b/src/app/modules/material-type/pages/add/add.component.html
index 7e087c8..de4391e 100644
--- a/src/app/modules/material-type/pages/add/add.component.html
+++ b/src/app/modules/material-type/pages/add/add.component.html
@@ -1,8 +1,6 @@
 <cre-entity-add
   title="Création d'un type de produit"
   backButtonLink="/catalog/materialtype/list"
-  [unknownError]="unknownError"
-  [customError]="errorMessage"
   [formFields]="formFields"
   (submit)="submit($event)">
 </cre-entity-add>
diff --git a/src/app/modules/material-type/pages/add/add.component.ts b/src/app/modules/material-type/pages/add/add.component.ts
index 1e18920..36b19e4 100644
--- a/src/app/modules/material-type/pages/add/add.component.ts
+++ b/src/app/modules/material-type/pages/add/add.component.ts
@@ -1,16 +1,17 @@
-import {Component} from '@angular/core';
-import {FormField} from "../../../shared/components/entity-add/entity-add.component";
-import {FormBuilder, Validators} from "@angular/forms";
-import {MaterialTypeService} from "../../service/material-type.service";
-import {SubscribingComponent} from "../../../shared/components/subscribing.component";
-import {ActivatedRoute, Router} from "@angular/router";
+import {Component} from '@angular/core'
+import {FormField} from '../../../shared/components/entity-add/entity-add.component'
+import {Validators} from '@angular/forms'
+import {MaterialTypeService} from '../../service/material-type.service'
+import {ErrorHandlingComponent} from '../../../shared/components/subscribing.component'
+import {ActivatedRoute, Router} from '@angular/router'
+import {ErrorModel, ErrorService} from '../../../shared/service/error.service'
 
 @Component({
   selector: 'cre-add',
   templateUrl: './add.component.html',
   styleUrls: ['./add.component.sass']
 })
-export class AddComponent extends SubscribingComponent {
+export class AddComponent extends ErrorHandlingComponent {
   formFields: FormField[] = [
     {
       name: 'name',
@@ -43,33 +44,30 @@ export class AddComponent extends SubscribingComponent {
       type: 'checkbox'
     }
   ]
-  unknownError = false
-  errorMessage: string | null
+  submittedValues: any | null
+
+  handledErrorModels: ErrorModel[] = [{
+    filter: error => error.status === 409 && error.error.id === this.submittedValues.name,
+    messageProducer: error => `Un type de produit avec le nom '${error.error.id}' existe déjà`
+  }, {
+    filter: error => error.status === 409 && error.error.id === this.submittedValues.prefix,
+    messageProducer: error => `Un type de produit avec le préfixe '${error.error.id}' existe déjà`
+  }]
 
   constructor(
     private materialTypeService: MaterialTypeService,
+    errorService: ErrorService,
     router: Router,
     activatedRoute: ActivatedRoute
   ) {
-    super(activatedRoute, router)
+    super(errorService, activatedRoute, router)
   }
 
   submit(values) {
-    this.subscribe(
+    this.submittedValues = values
+    this.subscribeAndNavigate(
       this.materialTypeService.save(values.name, values.prefix, values.usePercentages),
-      {
-        next: () => this.router.navigate(['/catalog/materialtype/list']),
-        error: err => {
-          if (err.status == 409 && err.error.id === values.name) {
-            this.errorMessage = `Un type de produit avec le nom '${values.name}' existe déjà`
-          } else if (err.status == 409 && err.error.id === values.prefix) {
-            this.errorMessage = `Un type de produit avec le préfixe '${values.prefix}' exists déjà`
-          } else {
-            this.unknownError = true
-          }
-          console.log(err)
-        }
-      }
+      '/catalog/materialtype/list'
     )
   }
 }
diff --git a/src/app/modules/material-type/pages/edit/edit.component.html b/src/app/modules/material-type/pages/edit/edit.component.html
index e54412d..07862c1 100644
--- a/src/app/modules/material-type/pages/edit/edit.component.html
+++ b/src/app/modules/material-type/pages/edit/edit.component.html
@@ -6,8 +6,6 @@
   deletePermission="REMOVE_MATERIAL_TYPE"
   [entity]="materialType"
   [formFields]="formFields"
-  [unknownError]="unknownError"
-  [customError]="errorMessage"
   (submit)="submit($event)"
   (delete)="delete()">
 </cre-entity-edit>
diff --git a/src/app/modules/material-type/pages/edit/edit.component.ts b/src/app/modules/material-type/pages/edit/edit.component.ts
index 89ad89e..c110e99 100644
--- a/src/app/modules/material-type/pages/edit/edit.component.ts
+++ b/src/app/modules/material-type/pages/edit/edit.component.ts
@@ -1,17 +1,18 @@
-import {Component} from '@angular/core';
-import {MaterialType} from "../../../shared/model/materialtype.model";
-import {ActivatedRoute, Router} from "@angular/router";
-import {SubscribingComponent} from "../../../shared/components/subscribing.component";
-import {MaterialTypeService} from "../../service/material-type.service";
-import {FormField} from "../../../shared/components/entity-add/entity-add.component";
-import {FormBuilder, Validators} from "@angular/forms";
+import {Component} from '@angular/core'
+import {MaterialType} from '../../../shared/model/materialtype.model'
+import {ActivatedRoute, Router} from '@angular/router'
+import {ErrorHandlingComponent} from '../../../shared/components/subscribing.component'
+import {MaterialTypeService} from '../../service/material-type.service'
+import {FormField} from '../../../shared/components/entity-add/entity-add.component'
+import {Validators} from '@angular/forms'
+import {ErrorModel, ErrorService} from '../../../shared/service/error.service'
 
 @Component({
   selector: 'cre-edit',
   templateUrl: './edit.component.html',
   styleUrls: ['./edit.component.sass']
 })
-export class EditComponent extends SubscribingComponent {
+export class EditComponent extends ErrorHandlingComponent {
   materialType: MaterialType | null
   formFields: FormField[] = [
     {
@@ -39,66 +40,49 @@ export class EditComponent extends SubscribingComponent {
       ]
     }
   ]
-  unknownError = false
-  errorMessage: string | null
+  submittedValues: any | null
+
+  handledErrorModels: ErrorModel[] = [{
+    filter: error => error.status === 409 && error.error.id === this.submittedValues.name,
+    messageProducer: error => `Un type de produit avec le nom '${error.error.id}' existe déjà`
+  }, {
+    filter: error => error.status === 409 && error.error.id === this.submittedValues.prefix,
+    messageProducer: error => `Un type de produit avec le préfixe '${error.error.id}' existe déjà`
+  }]
 
   constructor(
     private materialTypeService: MaterialTypeService,
+    errorService: ErrorService,
     router: Router,
     activatedRoute: ActivatedRoute
   ) {
-    super(activatedRoute, router)
+    super(errorService, activatedRoute, router)
   }
 
   ngOnInit() {
     super.ngOnInit()
 
     const id = parseInt(this.activatedRoute.snapshot.paramMap.get('id'))
-    this.subscribe(
-      this.materialTypeService.get(id),
-      {
-        next: materialType => this.materialType = materialType,
-        error: err => {
-          if (err.status === 404) {
-            this.router.navigate(['/employee/list'])
-          } else {
-            this.unknownError = true
-          }
-        }
-      },
-      1
+    this.subscribeEntityById(
+      this.materialTypeService,
+      id,
+      materialType => this.materialType = materialType,
+      '/employee/list'
     )
   }
 
   submit(values) {
-    this.subscribe(
+    this.submittedValues = values
+    this.subscribeAndNavigate(
       this.materialTypeService.update(this.materialType.id, values.name, values.prefix),
-      {
-        next: () => this.router.navigate(['/catalog/materialtype/list']),
-        error: err => {
-          if (err.status == 409 && err.error.id === values.name) {
-            this.errorMessage = `Un type de produit avec le nom '${values.name}' existe déjà`
-          } else if (err.status == 409 && err.error.id === values.prefix) {
-            this.errorMessage = `Un type de produit avec le préfixe '${values.prefix}' exists déjà`
-          } else {
-            this.unknownError = true
-          }
-          console.log(err)
-        }
-      }
+      '/catalog/materialtype/list'
     )
   }
 
   delete() {
-    this.subscribe(
+    this.subscribeAndNavigate(
       this.materialTypeService.delete(this.materialType.id),
-      {
-        next: () => this.router.navigate(['/catalog/materialtype/list']),
-        error: err => {
-          this.unknownError = true
-          console.log(err)
-        }
-      }
+      '/catalog/materialtype/list'
     )
   }
 }
diff --git a/src/app/modules/material-type/pages/list/list.component.ts b/src/app/modules/material-type/pages/list/list.component.ts
index a758493..6a9719e 100644
--- a/src/app/modules/material-type/pages/list/list.component.ts
+++ b/src/app/modules/material-type/pages/list/list.component.ts
@@ -1,16 +1,16 @@
-import {Component} from '@angular/core';
-import {MaterialTypeService} from "../../service/material-type.service";
-import {SubscribingComponent} from "../../../shared/components/subscribing.component";
-import {EmployeePermission} from "../../../shared/model/employee";
-import {FormBuilder} from "@angular/forms";
-import {ActivatedRoute, Router} from "@angular/router";
+import {Component} from '@angular/core'
+import {MaterialTypeService} from '../../service/material-type.service'
+import {ErrorHandlingComponent} from '../../../shared/components/subscribing.component'
+import {EmployeePermission} from '../../../shared/model/employee'
+import {ActivatedRoute, Router} from '@angular/router'
+import {ErrorService} from '../../../shared/service/error.service'
 
 @Component({
   selector: 'cre-list',
   templateUrl: './list.component.html',
   styleUrls: ['./list.component.sass']
 })
-export class ListComponent extends SubscribingComponent {
+export class ListComponent extends ErrorHandlingComponent {
   materialTypes$ = this.materialTypeService.all
   columns = [
     {def: 'name', title: 'Nom', valueFn: t => t.name},
@@ -28,9 +28,10 @@ export class ListComponent extends SubscribingComponent {
 
   constructor(
     private materialTypeService: MaterialTypeService,
+    errorService: ErrorService,
     router: Router,
     activatedRoute: ActivatedRoute
   ) {
-    super(activatedRoute, router)
+    super(errorService, activatedRoute, router)
   }
 }
diff --git a/src/app/modules/material-type/service/material-type.service.ts b/src/app/modules/material-type/service/material-type.service.ts
index fa6119c..1595ada 100644
--- a/src/app/modules/material-type/service/material-type.service.ts
+++ b/src/app/modules/material-type/service/material-type.service.ts
@@ -16,7 +16,7 @@ export class MaterialTypeService {
     return this.api.get<MaterialType[]>('/materialtype')
   }
 
-  get(id: number): Observable<MaterialType> {
+  getById(id: number): Observable<MaterialType> {
     return this.api.get<MaterialType>(`/materialtype/${id}`)
   }
 
diff --git a/src/app/modules/material/pages/add/add.component.html b/src/app/modules/material/pages/add/add.component.html
index 01034b6..afbcb2f 100644
--- a/src/app/modules/material/pages/add/add.component.html
+++ b/src/app/modules/material/pages/add/add.component.html
@@ -1,8 +1,6 @@
 <cre-entity-add
   title="Création d'un produit"
   backButtonLink="/catalog/material/list"
-  [unknownError]="unknownError"
-  [customError]="errorMessage"
   [formFields]="formFields"
   (submit)="submit($event)">
 </cre-entity-add>
diff --git a/src/app/modules/material/pages/add/add.component.ts b/src/app/modules/material/pages/add/add.component.ts
index b80da7b..a895cb6 100644
--- a/src/app/modules/material/pages/add/add.component.ts
+++ b/src/app/modules/material/pages/add/add.component.ts
@@ -1,18 +1,19 @@
-import {Component} from '@angular/core';
-import {FormField} from "../../../shared/components/entity-add/entity-add.component";
-import {FormBuilder, Validators} from "@angular/forms";
-import {MaterialService} from "../../service/material.service";
-import {MaterialTypeService} from "../../../material-type/service/material-type.service";
-import {ActivatedRoute, Router} from "@angular/router";
-import {SubscribingComponent} from "../../../shared/components/subscribing.component";
-import {map} from "rxjs/operators";
+import {Component} from '@angular/core'
+import {FormField} from '../../../shared/components/entity-add/entity-add.component'
+import {Validators} from '@angular/forms'
+import {MaterialService} from '../../service/material.service'
+import {MaterialTypeService} from '../../../material-type/service/material-type.service'
+import {ActivatedRoute, Router} from '@angular/router'
+import {ErrorHandlingComponent} from '../../../shared/components/subscribing.component'
+import {map} from 'rxjs/operators'
+import {ErrorModel, ErrorService} from '../../../shared/service/error.service'
 
 @Component({
   selector: 'cre-add',
   templateUrl: './add.component.html',
   styleUrls: ['./add.component.sass']
 })
-export class AddComponent extends SubscribingComponent {
+export class AddComponent extends ErrorHandlingComponent {
   formFields: FormField[] = [
     {
       name: 'name',
@@ -57,32 +58,26 @@ export class AddComponent extends SubscribingComponent {
       fileType: 'application/pdf'
     }
   ]
-  unknownError = false
-  errorMessage: string | null
+
+  handledErrorModels: ErrorModel[] = [{
+    filter: error => error.status === 409,
+    messageProducer: error => `Un produit avec le nom '${error.error.id}' existe déjà`
+  }]
 
   constructor(
     private materialService: MaterialService,
     private materialTypeService: MaterialTypeService,
+    errorService: ErrorService,
     router: Router,
     activatedRoute: ActivatedRoute
   ) {
-    super(activatedRoute, router)
+    super(errorService, activatedRoute, router)
   }
 
   submit(values) {
-    this.subscribe(
+    this.subscribeAndNavigate(
       this.materialService.save(values.name, values.inventoryQuantity, values.materialType, values.simdutFile),
-      {
-        next: () => this.router.navigate(['/catalog/material/list']),
-        error: err => {
-          if (err.status == 409) {
-            this.errorMessage = `Un produit avec le nom '${values.name}' existe déjà`
-          } else {
-            this.unknownError = true
-          }
-          console.log(err)
-        }
-      }
+      '/catalog/material/list'
     )
   }
 }
diff --git a/src/app/modules/material/pages/edit/edit.component.html b/src/app/modules/material/pages/edit/edit.component.html
index fae31be..e6d5051 100644
--- a/src/app/modules/material/pages/edit/edit.component.html
+++ b/src/app/modules/material/pages/edit/edit.component.html
@@ -6,8 +6,6 @@
   deletePermission="REMOVE_MATERIAL"
   [entity]="material"
   [formFields]="formFields"
-  [unknownError]="unknownError"
-  [customError]="errorMessage"
   (submit)="submit($event)"
   (delete)="delete()">
 </cre-entity-edit>
@@ -25,11 +23,10 @@
       Voir la fiche signalitique
     </button>
     <cre-file-button
-      #simdutFileButton
       color="accent"
       label="Modifier la fiche signalitique"
       accept="application/pdf"
-    (change)="selectedSimdutFile = $event.target.files[0]">
+      (change)="selectedSimdutFile = $event.target.files[0]">
     </cre-file-button>
   </div>
 </ng-template>
diff --git a/src/app/modules/material/pages/edit/edit.component.ts b/src/app/modules/material/pages/edit/edit.component.ts
index 6a17fc0..0395e5f 100644
--- a/src/app/modules/material/pages/edit/edit.component.ts
+++ b/src/app/modules/material/pages/edit/edit.component.ts
@@ -1,21 +1,21 @@
-import {Component, ViewChild} from '@angular/core';
-import {FormField} from "../../../shared/components/entity-add/entity-add.component";
-import {Validators} from "@angular/forms";
-import {map} from "rxjs/operators";
-import {MaterialTypeService} from "../../../material-type/service/material-type.service";
-import {MaterialService} from "../../service/material.service";
-import {ActivatedRoute, Router} from "@angular/router";
-import {SubscribingComponent} from "../../../shared/components/subscribing.component";
-import {Material} from "../../../shared/model/material.model";
-import {environment} from "../../../../../environments/environment";
-import {FileButtonComponent} from "../../../shared/file-button/file-button.component";
+import {Component, ViewChild} from '@angular/core'
+import {FormField} from '../../../shared/components/entity-add/entity-add.component'
+import {Validators} from '@angular/forms'
+import {map} from 'rxjs/operators'
+import {MaterialTypeService} from '../../../material-type/service/material-type.service'
+import {MaterialService} from '../../service/material.service'
+import {ActivatedRoute, Router} from '@angular/router'
+import {ErrorHandlingComponent} from '../../../shared/components/subscribing.component'
+import {Material} from '../../../shared/model/material.model'
+import {environment} from '../../../../../environments/environment'
+import {ErrorModel, ErrorService} from '../../../shared/service/error.service'
 
 @Component({
   selector: 'cre-edit',
   templateUrl: './edit.component.html',
   styleUrls: ['./edit.component.sass']
 })
-export class EditComponent extends SubscribingComponent {
+export class EditComponent extends ErrorHandlingComponent {
   @ViewChild('simdutTemplate', {static: true}) simdutTemplateRef
 
   material: Material | null
@@ -64,79 +64,59 @@ export class EditComponent extends SubscribingComponent {
       fileType: 'application/pdf'
     }
   ]
-  unknownError = false
-  errorMessage: string | null
   hasSimdut = false
   selectedSimdutFile: File | null
 
+  handledErrorModels: ErrorModel[] = [{
+    filter: error => error.status === 409,
+    messageProducer: error => `Un produit avec le nom '${error.error.id}' existe déjà`
+  }]
+
   constructor(
     private materialService: MaterialService,
     private materialTypeService: MaterialTypeService,
+    errorService: ErrorService,
     router: Router,
     activatedRoute: ActivatedRoute
   ) {
-    super(activatedRoute, router)
+    super(errorService, activatedRoute, router)
   }
 
   ngOnInit() {
-    super.ngOnInit();
+    super.ngOnInit()
 
     this.formFields[3].template = this.simdutTemplateRef
 
     const id = parseInt(this.activatedRoute.snapshot.paramMap.get('id'))
-    this.subscribe(
-      this.materialService.getById(id),
-      {
-        next: material => this.material = material,
-        error: err => {
-          if (err.status === 404) {
-            this.router.navigate(['/catalog/material/list'])
-          } else {
-            this.unknownError = true
-          }
-        }
-      },
-      1
+    this.subscribeEntityById(
+      this.materialService,
+      id,
+      material => this.material = material,
+      '/catalog/material/list'
     )
 
     this.subscribe(
       this.materialService.hasSimdut(id),
-      {next: b => this.hasSimdut = b}
+      b => this.hasSimdut = b
     )
   }
 
   submit(values) {
-    this.subscribe(
+    this.subscribeAndNavigate(
       this.materialService.update(this.material.id, values.name, values.inventoryQuantity, values.materialType, this.selectedSimdutFile),
-      {
-        next: () => this.router.navigate(['/catalog/material/list']),
-        error: err => {
-          if (err.status == 409) {
-            this.errorMessage = `Un produit avec le nom '${values.name}' existe déjà`
-          } else {
-            this.unknownError = true
-            console.error(err)
-          }
-        }
-      }
+      '/catalog/material/list'
     )
   }
 
   delete() {
-    this.subscribe(
+    this.subscribeAndNavigate(
       this.materialService.delete(this.material.id),
-      {
-        next: () => this.router.navigate(['/catalog/material/list']),
-        error: err => {
-          this.unknownError = true
-          console.error(err)
-        }
-      }
+      '/catalog/material/list'
     )
   }
 
   openSimdutUrl() {
     const simdutUrl = environment.apiUrl + `/material/${this.material.id}/simdut`
-    window.open(simdutUrl, "_blank")
+    window.open(simdutUrl, '_blank')
   }
 }
diff --git a/src/app/modules/material/pages/list/list.component.ts b/src/app/modules/material/pages/list/list.component.ts
index 5fc6e62..7092ac6 100644
--- a/src/app/modules/material/pages/list/list.component.ts
+++ b/src/app/modules/material/pages/list/list.component.ts
@@ -1,17 +1,17 @@
-import {Component} from '@angular/core';
-import {SubscribingComponent} from "../../../shared/components/subscribing.component";
-import {MaterialService} from "../../service/material.service";
-import {EmployeePermission} from "../../../shared/model/employee";
-import {environment} from "../../../../../environments/environment";
-import {FormBuilder} from "@angular/forms";
-import {ActivatedRoute, Router} from "@angular/router";
+import {Component} from '@angular/core'
+import {ErrorHandlingComponent} from '../../../shared/components/subscribing.component'
+import {MaterialService} from '../../service/material.service'
+import {EmployeePermission} from '../../../shared/model/employee'
+import {environment} from '../../../../../environments/environment'
+import {ActivatedRoute, Router} from '@angular/router'
+import {ErrorService} from '../../../shared/service/error.service'
 
 @Component({
   selector: 'cre-list',
   templateUrl: './list.component.html',
   styleUrls: ['./list.component.sass']
 })
-export class ListComponent extends SubscribingComponent {
+export class ListComponent extends ErrorHandlingComponent {
   materials$ = this.materialService.allNotMixType
   columns = [
     {def: 'name', title: 'Code', valueFn: t => t.name},
@@ -42,26 +42,25 @@ export class ListComponent extends SubscribingComponent {
 
   constructor(
     private materialService: MaterialService,
+    errorService: ErrorService,
     router: Router,
     activatedRoute: ActivatedRoute
   ) {
-    super(activatedRoute, router)
+    super(errorService, activatedRoute, router)
   }
 
   ngOnInit() {
-    super.ngOnInit();
+    super.ngOnInit()
 
     this.subscribe(
       this.materials$,
-      {
-        next: mArray => {
-          mArray.forEach(m => {
-            this.subscribe(
-              this.materialService.hasSimdut(m.id),
-              { next: b => this.hasSimdutMap[m.id] = b }
-            )
-          })
-        }
+      mArray => {
+        mArray.forEach(m => {
+          this.subscribe(
+            this.materialService.hasSimdut(m.id),
+            b => this.hasSimdutMap[m.id] = b
+          )
+        })
       },
       1
     )
diff --git a/src/app/modules/shared/components/entity-add/entity-add.component.html b/src/app/modules/shared/components/entity-add/entity-add.component.html
index 86ffa13..9e0876e 100644
--- a/src/app/modules/shared/components/entity-add/entity-add.component.html
+++ b/src/app/modules/shared/components/entity-add/entity-add.component.html
@@ -3,11 +3,6 @@
     <mat-card-title>{{title}}</mat-card-title>
   </mat-card-header>
   <mat-card-content>
-    <div *ngIf="unknownError || customError" class="alert alert-danger">
-      <p *ngIf="unknownError">Une erreur est survenue</p>
-      <p *ngIf="customError">{{customError}}</p>
-    </div>
-
     <form *ngIf="form" [formGroup]="form">
       <ng-container *ngFor="let field of formFields">
         <ng-container
diff --git a/src/app/modules/shared/components/entity-add/entity-add.component.ts b/src/app/modules/shared/components/entity-add/entity-add.component.ts
index e48bda7..586a6bf 100644
--- a/src/app/modules/shared/components/entity-add/entity-add.component.ts
+++ b/src/app/modules/shared/components/entity-add/entity-add.component.ts
@@ -1,30 +1,23 @@
-import {Component, EventEmitter, Input, Output} from '@angular/core';
-import {SubscribingComponent} from "../subscribing.component";
-import {FormBuilder, FormControl, FormGroup, ValidatorFn} from "@angular/forms";
-import {Observable} from "rxjs";
-import {ActivatedRoute, Router} from "@angular/router";
+import {Component, EventEmitter, Input, Output} from '@angular/core'
+import {FormBuilder, FormControl, FormGroup, ValidatorFn} from '@angular/forms'
+import {Observable} from 'rxjs'
 
 @Component({
   selector: 'cre-entity-add',
   templateUrl: './entity-add.component.html',
   styleUrls: ['./entity-add.component.sass']
 })
-export class EntityAddComponent extends SubscribingComponent {
+export class EntityAddComponent {
   @Input() title: string
   @Input() backButtonLink: string
-  @Input() unknownError: boolean = false
-  @Input() customError: string | null
   @Input() formFields: FormField[]
   @Output() submit = new EventEmitter<any>()
 
   form: FormGroup | null
 
   constructor(
-    private formBuilder: FormBuilder,
-    router: Router,
-    activatedRoute: ActivatedRoute
+    private formBuilder: FormBuilder
   ) {
-    super(activatedRoute, router)
   }
 
   ngOnInit() {
@@ -33,8 +26,6 @@ export class EntityAddComponent extends SubscribingComponent {
       formGroup[f.name] = new FormControl(null, f.validator)
     })
     this.form = this.formBuilder.group(formGroup)
-
-    super.ngOnInit();
   }
 
   submitForm() {
diff --git a/src/app/modules/shared/components/entity-edit/entity-edit.component.html b/src/app/modules/shared/components/entity-edit/entity-edit.component.html
index f4a31d3..a02ea93 100644
--- a/src/app/modules/shared/components/entity-edit/entity-edit.component.html
+++ b/src/app/modules/shared/components/entity-edit/entity-edit.component.html
@@ -3,11 +3,6 @@
     <mat-card-title>{{title}}</mat-card-title>
   </mat-card-header>
   <mat-card-content [class.no-action]="disableButtons">
-    <div *ngIf="unknownError || customError" class="alert alert-danger">
-      <p *ngIf="unknownError">Une erreur est survenue</p>
-      <p *ngIf="customError">{{customError}}</p>
-    </div>
-
     <form [formGroup]="form">
       <ng-container *ngFor="let field of formFields">
         <ng-container
diff --git a/src/app/modules/shared/components/entity-edit/entity-edit.component.ts b/src/app/modules/shared/components/entity-edit/entity-edit.component.ts
index 93de76e..04374fe 100644
--- a/src/app/modules/shared/components/entity-edit/entity-edit.component.ts
+++ b/src/app/modules/shared/components/entity-edit/entity-edit.component.ts
@@ -1,25 +1,21 @@
-import {Component, EventEmitter, Input, Output} from '@angular/core';
-import {FormBuilder, FormControl, FormGroup} from "@angular/forms";
-import {SubscribingComponent} from "../subscribing.component";
-import {FormField} from "../entity-add/entity-add.component";
-import {EmployeePermission} from "../../model/employee";
-import {AccountService} from "../../../accounts/services/account.service";
-import {ActivatedRoute, Router} from "@angular/router";
+import {Component, EventEmitter, Input, Output} from '@angular/core'
+import {FormBuilder, FormControl, FormGroup} from '@angular/forms'
+import {FormField} from '../entity-add/entity-add.component'
+import {EmployeePermission} from '../../model/employee'
+import {AccountService} from '../../../accounts/services/account.service'
 
 @Component({
   selector: 'cre-entity-edit',
   templateUrl: './entity-edit.component.html',
   styleUrls: ['./entity-edit.component.sass']
 })
-export class EntityEditComponent extends SubscribingComponent {
+export class EntityEditComponent {
   @Input() entity: any
   @Input() title: string
   @Input() deleteConfirmMessage: string
   @Input() backButtonLink: string
   @Input() formFields: FormField[]
   @Input() deletePermission: EmployeePermission
-  @Input() unknownError = false
-  @Input() customError: string | null
   @Input() disableButtons: boolean
   @Input() noTopMargin = false
   @Output() submit = new EventEmitter<any>()
@@ -29,21 +25,19 @@ export class EntityEditComponent extends SubscribingComponent {
 
   constructor(
     private accountService: AccountService,
-    private formBuilder: FormBuilder,
-    router: Router,
-    activatedRoute: ActivatedRoute
+    private formBuilder: FormBuilder
   ) {
-    super(activatedRoute, router)
   }
 
   ngOnInit() {
     const formGroup = {}
     this.formFields.forEach(f => {
-      formGroup[f.name] = new FormControl({value: f.valueFn ? f.valueFn(this.entity) : this.entity[f.name], disabled: f.readonly}, f.validator)
+      formGroup[f.name] = new FormControl({
+        value: f.valueFn ? f.valueFn(this.entity) : this.entity[f.name],
+        disabled: f.readonly
+      }, f.validator)
     })
     this.form = this.formBuilder.group(formGroup)
-
-    super.ngOnInit();
   }
 
   submitForm() {
diff --git a/src/app/modules/shared/components/entity-list/entity-list.component.ts b/src/app/modules/shared/components/entity-list/entity-list.component.ts
index 93eb95a..752a1cb 100644
--- a/src/app/modules/shared/components/entity-list/entity-list.component.ts
+++ b/src/app/modules/shared/components/entity-list/entity-list.component.ts
@@ -1,17 +1,14 @@
-import {Component, Input} from '@angular/core';
-import {Observable} from "rxjs";
-import {SubscribingComponent} from "../subscribing.component";
-import {AccountService} from "../../../accounts/services/account.service";
-import {EmployeePermission} from "../../model/employee";
-import {FormBuilder} from "@angular/forms";
-import {ActivatedRoute, Router} from "@angular/router";
+import {Component, Input} from '@angular/core'
+import {Observable} from 'rxjs'
+import {AccountService} from '../../../accounts/services/account.service'
+import {EmployeePermission} from '../../model/employee'
 
 @Component({
   selector: 'cre-entity-list',
   templateUrl: './entity-list.component.html',
   styleUrls: ['./entity-list.component.sass']
 })
-export class EntityListComponent<T> extends SubscribingComponent {
+export class EntityListComponent<T> {
   @Input() entities$: Observable<T>
   @Input() columns: TableColumn[]
   @Input() icons: TableIcon[]
@@ -20,11 +17,8 @@ export class EntityListComponent<T> extends SubscribingComponent {
   @Input() addPermission: EmployeePermission
 
   constructor(
-    private accountService: AccountService,
-    router: Router,
-    activatedRoute: ActivatedRoute
+    private accountService: AccountService
   ) {
-    super(activatedRoute, router)
   }
 
   hasPermissionToUseButton(button: TableButton): boolean {
@@ -50,7 +44,9 @@ export class EntityListComponent<T> extends SubscribingComponent {
       }
     }
 
-    if (externalLink) window.open(externalLink, "_blank")
+    if (externalLink) {
+      window.open(externalLink, '_blank')
+    }
   }
 
   get tableCols(): string[] {
diff --git a/src/app/modules/shared/components/global-alert-handler/global-alert-handler.component.html b/src/app/modules/shared/components/global-alert-handler/global-alert-handler.component.html
new file mode 100644
index 0000000..3c63ac7
--- /dev/null
+++ b/src/app/modules/shared/components/global-alert-handler/global-alert-handler.component.html
@@ -0,0 +1,11 @@
+<div class="alerts-wrapper" [style.margin-top.rem]="extraTopMarginSize">
+  <div
+    *ngFor="let alert of alertBuffer"
+    [@fadeIn]
+    class="alert"
+    [class.alert-success]="alert.alert.type === SUCCESS_ALERT_TYPE"
+    [class.alert-warning]="alert.alert.type === WARNING_ALERT_TYPE"
+    [class.alert-danger]="alert.alert.type === ERROR_ALERT_TYPE">
+    {{alert.alert.message}}
+  </div>
+</div>
diff --git a/src/app/modules/shared/components/global-alert-handler/global-alert-handler.component.sass b/src/app/modules/shared/components/global-alert-handler/global-alert-handler.component.sass
new file mode 100644
index 0000000..38cba08
--- /dev/null
+++ b/src/app/modules/shared/components/global-alert-handler/global-alert-handler.component.sass
@@ -0,0 +1,28 @@
+@import '../../../../../custom-theme'
+
+.alerts-wrapper
+  position: absolute
+  width: 100vw
+
+  &.subnav-margin
+    margin-top: 3rem
+
+  .alert
+    width: max-content
+    margin: 1rem auto
+    z-index: 50
+
+  .alert-danger
+    color: map-get($theme-error, 900)
+    border-color: map-get($theme-error, 200)
+    background-color: map-get($theme-error, 100)
+
+  .alert-warning
+    color: map-get($theme-warning, 900)
+    border-color: map-get($theme-warning, 400)
+    background-color: map-get($theme-warning, 100)
+
+  .alert-success
+    color: map-get($theme-accent, 900)
+    border-color: map-get($theme-accent, 400)
+    background-color: map-get($theme-accent, 100)
diff --git a/src/app/modules/shared/components/global-alert-handler/global-alert-handler.component.ts b/src/app/modules/shared/components/global-alert-handler/global-alert-handler.component.ts
new file mode 100644
index 0000000..9b96c4b
--- /dev/null
+++ b/src/app/modules/shared/components/global-alert-handler/global-alert-handler.component.ts
@@ -0,0 +1,33 @@
+import {Component} from '@angular/core'
+import {AlertHandlerComponent, AlertService, AlertType} from '../../service/alert.service'
+import {animate, state, style, transition, trigger} from '@angular/animations'
+
+@Component({
+  selector: 'cre-global-alert-handler',
+  templateUrl: './global-alert-handler.component.html',
+  styleUrls: ['./global-alert-handler.component.sass'],
+  animations: [
+    trigger('fadeIn', [
+      state('void', style({
+        opacity: 0,
+        transform: 'scale(0.5)'
+      })),
+      transition('void <=> *', animate(100))
+    ])
+  ]
+})
+export class GlobalAlertHandlerComponent extends AlertHandlerComponent {
+  public static extraTopMarginMultiplier = 0
+
+  readonly SUCCESS_ALERT_TYPE = AlertType.Success
+  readonly WARNING_ALERT_TYPE = AlertType.Warning
+  readonly ERROR_ALERT_TYPE = AlertType.Error
+
+  constructor(alertService: AlertService) {
+    super(alertService)
+  }
+
+  get extraTopMarginSize(): number {
+    return GlobalAlertHandlerComponent.extraTopMarginMultiplier * 3
+  }
+}
diff --git a/src/app/modules/shared/components/header/header.component.ts b/src/app/modules/shared/components/header/header.component.ts
index 65ab5d0..469c697 100644
--- a/src/app/modules/shared/components/header/header.component.ts
+++ b/src/app/modules/shared/components/header/header.component.ts
@@ -1,10 +1,10 @@
-import {Component} from '@angular/core';
-import {ActivatedRoute, ResolveEnd, Router} from "@angular/router";
-import {AppState} from "../../app-state";
-import {Employee, EmployeePermission} from "../../model/employee";
-import {AccountService} from "../../../accounts/services/account.service";
-import {SubscribingComponent} from "../subscribing.component";
-import {FormBuilder} from "@angular/forms";
+import {Component} from '@angular/core'
+import {ActivatedRoute, ResolveEnd, Router} from '@angular/router'
+import {AppState} from '../../app-state'
+import {Employee, EmployeePermission} from '../../model/employee'
+import {AccountService} from '../../../accounts/services/account.service'
+import {SubscribingComponent} from '../subscribing.component'
+import {ErrorService} from '../../service/error.service'
 
 @Component({
   selector: 'cre-header',
@@ -19,44 +19,45 @@ export class HeaderComponent extends SubscribingComponent {
     {route: '/group', title: 'Groupes', requiredPermission: EmployeePermission.VIEW_EMPLOYEE_GROUP},
     {route: '/account/login', title: 'Connexion', enabled: true},
     {route: '/account/logout', title: 'Déconnexion', enabled: false},
-  ];
+  ]
   _activeLink = this.links[0].route
 
   constructor(
     private accountService: AccountService,
     private appState: AppState,
+    errorService: ErrorService,
     router: Router,
     activatedRoute: ActivatedRoute
   ) {
-    super(activatedRoute, router)
+    super(errorService, activatedRoute, router)
   }
 
   ngOnInit(): void {
+    super.ngOnInit()
+    this.accountService.checkAuthenticationStatus()
+
     // Gets the current route
     this.subscribe(
       this.router.events,
-      {
-        next: data => {
-          if (data instanceof ResolveEnd) this._activeLink = data.url
+      data => {
+        if (data instanceof ResolveEnd) {
+          this._activeLink = data.url
         }
       },
       1
     )
 
     // Auth status
-    this.accountService.checkAuthenticationStatus()
     this.updateEnabledLinks(this.appState.isAuthenticated, this.appState.authenticatedEmployee)
     this.subscribe(
       this.appState.authenticatedUser$,
-      {next: authentication => this.updateEnabledLinks(authentication.authenticated, authentication.authenticatedUser)}
+      authentication => this.updateEnabledLinks(authentication.authenticated, authentication.authenticatedUser)
     )
-
-    super.ngOnInit()
   }
 
   ngOnDestroy(): void {
     this.accountService.logout(() => {
-      console.log("Successfully logged out")
+      console.log('Successfully logged out')
     })
 
     super.ngOnDestroy()
@@ -77,7 +78,7 @@ export class HeaderComponent extends SubscribingComponent {
 
     this.links.forEach(l => {
       if (l.requiredPermission) {
-        l.enabled = employee && employee.permissions.indexOf(l.requiredPermission) >= 0;
+        l.enabled = employee && employee.permissions.indexOf(l.requiredPermission) >= 0
       }
     })
   }
diff --git a/src/app/modules/shared/components/subscribing.component.ts b/src/app/modules/shared/components/subscribing.component.ts
index 16d9a99..d19ce1b 100644
--- a/src/app/modules/shared/components/subscribing.component.ts
+++ b/src/app/modules/shared/components/subscribing.component.ts
@@ -1,60 +1,50 @@
-import {take, takeUntil} from "rxjs/operators";
-import {OnDestroy, OnInit} from "@angular/core";
-import {Observable, Subject} from "rxjs";
-import {ActivatedRoute, Router} from "@angular/router";
-import {UrlUtils} from "../utils/url.utils";
+import {take, takeUntil} from 'rxjs/operators'
+import {OnDestroy, OnInit} from '@angular/core'
+import {Observable, Subject} from 'rxjs'
+import {ActivatedRoute, Router} from '@angular/router'
+import {UrlUtils} from '../utils/url.utils'
+import {ErrorHandler, ErrorModel, ErrorService} from '../service/error.service'
 
 export abstract class SubscribingComponent implements OnInit, OnDestroy {
   protected subscribers$ = []
   protected destroy$ = new Subject<boolean>()
-  unknownError = false
 
   protected constructor(
+    protected errorService: ErrorService,
     protected activatedRoute: ActivatedRoute,
     protected router: Router,
     protected urlUtils = new UrlUtils(activatedRoute, router)
   ) {
   }
 
-  subscribe<T>(observable: Observable<T>, observer, take_count = -1) {
-    if (!observer.error) {
-      observer.error = err => this.handleObserverError(err)
-    }
-
+  subscribe<T>(observable: Observable<T>, resultConsumer: (T) => void, take_count = -1) {
     if (take_count >= 0) {
       observable.pipe(take(take_count), takeUntil(this.destroy$))
     } else {
       observable.pipe(takeUntil(this.destroy$))
     }
-    this.subscribers$.push(observable.subscribe(observer))
+
+    this.subscribers$.push(observable.subscribe({
+      next: resultConsumer,
+      error: err => this.errorService.handleError(err)
+    }))
   }
 
   subscribeAndNavigate(observable: Observable<any>, route: string) {
     this.subscribe(
       observable,
-      {
-        next: () => this.urlUtils.navigateTo(route)
-      },
+      () => this.urlUtils.navigateTo(route),
       1
     )
   }
 
-  subscribeEntityByIdFromRoute<T>(service: any, entitySubject: Subject<T>, notFoundRoute: string, paramName: string = 'id') {
-    const id = this.urlUtils.parseIntUrlParam(paramName)
-    this.subscribe(
-      service.getById(id),
-      {
-        next: e => entitySubject.next(e),
-        error: err => {
-          if (err.status === 404) {
-            this.urlUtils.navigateTo(notFoundRoute)
-          } else {
-            this.handleObserverError(err)
-          }
-        }
-      },
-      1
-    )
+  subscribeEntityById<T>(service: any, id: number, resultConsumer: (T) => void, notFoundRoute: string) {
+    this.subscribers$.push(service.getById(id)
+      .pipe(take(1), takeUntil(this.destroy$))
+      .subscribe({
+        next: e => resultConsumer(e),
+        error: err => this.handleNotFoundError(err, notFoundRoute)
+      }))
   }
 
   ngOnInit(): void {
@@ -65,16 +55,24 @@ export abstract class SubscribingComponent implements OnInit, OnDestroy {
     this.destroy$.complete()
   }
 
-  handleObserverError(error: any) {
-    console.error(error)
-    this.unknownError = true
-  }
-
   handleNotFoundError(error: any, route: string) {
     if (error.status === 404) {
       this.urlUtils.navigateTo(route)
     } else {
-      this.handleObserverError(error)
+      this.errorService.handleError(error)
     }
   }
 }
+
+export abstract class ErrorHandlingComponent extends SubscribingComponent implements ErrorHandler {
+  handledErrorModels: ErrorModel[] = []
+
+  protected constructor(
+    errorService: ErrorService,
+    activatedRoute: ActivatedRoute,
+    router: Router
+  ) {
+    super(errorService, activatedRoute, router)
+    this.errorService.activeErrorHandler = this
+  }
+}
diff --git a/src/app/modules/shared/service/alert.service.ts b/src/app/modules/shared/service/alert.service.ts
new file mode 100644
index 0000000..a0ae090
--- /dev/null
+++ b/src/app/modules/shared/service/alert.service.ts
@@ -0,0 +1,112 @@
+import {Injectable, OnDestroy} from '@angular/core'
+import {interval, Subject} from 'rxjs'
+import {takeUntil} from 'rxjs/operators'
+
+@Injectable({
+  providedIn: 'root'
+})
+export class AlertService {
+  private alertQueue: Alert[] = []
+  private activeHandler: AlertHandlerComponent
+
+  pushSuccess(message: String) {
+    this.enqueue(AlertType.Success, message)
+  }
+
+  pushWarning(message: String) {
+    this.enqueue(AlertType.Warning, message)
+  }
+
+  pushError(message: String) {
+    this.enqueue(AlertType.Error, message)
+  }
+
+  set activeAlertHandlerComponent(handler: AlertHandlerComponent) {
+    this.activeHandler = handler
+  }
+
+  private enqueue(type: AlertType, message: String) {
+    this.alertQueue.unshift({type, message})
+  }
+
+  dequeue(): Alert {
+    return this.alertQueue.pop()
+  }
+}
+
+/**
+ * An alert handler component is a component that will show the alerts pushed by the alert system to the user.
+ */
+export abstract class AlertHandlerComponent implements OnDestroy {
+  protected static readonly DEFAULT_ALERT_BUFFER_SIZE = 3
+  protected static readonly DEFAULT_ALERT_DURATION = 5
+
+  alertBuffer = new Array<{ alert: Alert, time: number }>()
+  protected alertBufferSize: number = AlertHandlerComponent.DEFAULT_ALERT_BUFFER_SIZE
+  protected alertDuration: number = AlertHandlerComponent.DEFAULT_ALERT_DURATION
+  protected alertDurationCounter = 0
+
+  private destroy$ = new Subject<boolean>()
+
+  protected constructor(
+    protected alertService: AlertService
+  ) {
+    alertService.activeAlertHandlerComponent = this
+
+    interval(1000)
+      .pipe(takeUntil(this.destroy$))
+      .subscribe({
+        next: () => {
+          this.alertDurationCounter++
+          if (!this.isBufferEmpty) {
+            this.alertBuffer
+              .filter(a => a.time + this.alertDuration < this.alertDurationCounter)
+              .map(a => this.alertBuffer.indexOf(a))
+              .forEach(i => this.alertBuffer.splice(i, 1))
+          }
+          if (!this.isBufferFull) {
+            this.pullAlert()
+          }
+        }
+      })
+  }
+
+  ngOnDestroy(): void {
+    this.destroy$.next(true)
+    this.destroy$.complete()
+  }
+
+  pullAlert() {
+    const nextAlert = this.alertService.dequeue()
+    if (nextAlert) {
+      this.alertBuffer.unshift({alert: nextAlert, time: this.alertDurationCounter})
+    }
+  }
+
+  get isBufferEmpty(): boolean {
+    return this.alertBuffer.length == 0
+  }
+
+  get isBufferFull(): boolean {
+    return this.alertBuffer.length >= this.alertBufferSize
+  }
+}
+
+/**
+ * An alert is a message that will be shown to the user.
+ *
+ * An alert can be a success alert, a warning alert of an error alert.
+ */
+class Alert {
+  constructor(
+    public type: AlertType,
+    public message: String
+  ) {
+  }
+}
+
+export enum AlertType {
+  Success,
+  Warning,
+  Error
+}
diff --git a/src/app/modules/shared/service/api.service.ts b/src/app/modules/shared/service/api.service.ts
index 0ae027c..de167a2 100644
--- a/src/app/modules/shared/service/api.service.ts
+++ b/src/app/modules/shared/service/api.service.ts
@@ -6,6 +6,7 @@ import {AppState} from '../app-state'
 import {Router} from '@angular/router'
 import {map, share, takeUntil} from 'rxjs/operators'
 import {valueOr} from '../utils/optional.utils'
+import {ErrorService} from './error.service'
 
 @Injectable({
   providedIn: 'root'
@@ -14,6 +15,7 @@ export class ApiService implements OnDestroy {
   private _destroy$ = new Subject<boolean>()
 
   constructor(
+    private errorService: ErrorService,
     private http: HttpClient,
     private appState: AppState,
     private router: Router
@@ -85,15 +87,6 @@ export class ApiService implements OnDestroy {
       : requestFn(httpOptions)
         .pipe(takeUntil(this._destroy$), map(r => r.body), share())
 
-    const errorCheckSubscription = result$.subscribe({
-      next: () => this.appState.isServerOnline = true,
-      error: err => {
-        console.error(err)
-        errorCheckSubscription.unsubscribe()
-        this.appState.isServerOnline = !(err.status === 0 && err.statusText === 'Unknown Error' || err.status === 502)
-      }
-    })
-
     return result$
   }
 
diff --git a/src/app/modules/shared/service/error.service.ts b/src/app/modules/shared/service/error.service.ts
new file mode 100644
index 0000000..8c16715
--- /dev/null
+++ b/src/app/modules/shared/service/error.service.ts
@@ -0,0 +1,110 @@
+import {Injectable} from '@angular/core'
+import {AlertService} from './alert.service'
+import {AppState} from '../app-state'
+
+@Injectable({
+  providedIn: 'root'
+})
+export class ErrorService {
+  private static readonly UNKNOWN_ERROR_MESSAGE = 'Une erreur inconnue est survenue'
+  private defaultHandledErrorModels: ErrorModel[] = [{
+    filter: error => error.status === 0 && error.statusText === 'Unknown Error' || error.status === 502,
+    consumer: () => this.appState.isServerOnline = false
+  }, {
+    filter: error => error.status === 400,
+    consumer: error => console.error(error),
+    messageProducer: () => 'Certaines informations dans la requête étaient invalides'
+  }, {
+    filter: error => error.status === 401,
+    messageProducer: () => 'Vous devez être connecté pour effectuer cette action'
+  }, {
+    filter: error => error.status === 403,
+    messageProducer: () => 'Vous n\'avez pas la permission d\'effectuer cette action'
+  }, {
+    filter: error => error.status === 404,
+    messageProducer: () => 'La resource demandée n\'a pas été trouvée'
+  }, {
+    filter: error => error.status === 409,
+    messageProducer: () => 'Un conflit avec une autre resource s\'est produit'
+  }, {
+    filter: error => error.status === 500,
+    messageProducer: () => ErrorService.UNKNOWN_ERROR_MESSAGE
+  }]
+
+  private activeHandler: ErrorHandler
+
+  constructor(
+    private alertService: AlertService,
+    private appState: AppState
+  ) {
+  }
+
+  handleError(error: any) {
+    let matchingModels
+
+    if (this.activeHandler) {
+      matchingModels = this.activeHandler.handledErrorModels.filter(m => m.filter(error)) // Find error models whose filter matches the current error
+    } else {
+      console.warn('An error occurred but no handler was set')
+    }
+
+    if (!matchingModels || matchingModels.length == 0) {  // If none are found, search in defaults handlers
+      matchingModels = this.defaultHandledErrorModels.filter(m => m.filter(error))
+    }
+
+    if (!matchingModels || matchingModels.length == 0) { // If still none are found, handle as an unknown error
+      this.consumeUnknownError(error)
+      return
+    }
+
+    matchingModels.forEach(m => {
+      if (m.consumer || m.messageProducer) {
+        if (m.consumer) {
+          m.consumer(error)
+        }
+        if (m.messageProducer) {
+          this.alertService.pushError(m.messageProducer(error))
+        }
+      } else {
+        console.error('An error model has no consumer or message')
+      }
+    })
+  }
+
+  consumeUnknownError(error: any) {
+    console.error(error)
+    this.pushUnknownError()
+  }
+
+  pushUnknownError() {
+    this.alertService.pushError(ErrorService.UNKNOWN_ERROR_MESSAGE)
+  }
+
+  set activeErrorHandler(handler: ErrorHandler) {
+    this.activeHandler = handler
+  }
+}
+
+/**
+ * An error handler, defining models of errors that this type will handle
+ */
+export interface ErrorHandler {
+  handledErrorModels: ErrorModel[]
+}
+
+/**
+ * An error model define how errors matching its filter will be handled.
+ *
+ * The consumer will consume matching errors when they occurs.
+ * The message producer returns a string that will be pushed to the alert system.
+ *
+ * To work correctly a model must define at least one handler (consumer or message producer).
+ */
+export class ErrorModel {
+  constructor(
+    public filter: (error: any) => Boolean,
+    public consumer?: (error: any) => void,
+    public messageProducer?: (error: any) => String
+  ) {
+  }
+}
diff --git a/src/app/modules/shared/shared.module.ts b/src/app/modules/shared/shared.module.ts
index 62c3d95..8ea2b4a 100644
--- a/src/app/modules/shared/shared.module.ts
+++ b/src/app/modules/shared/shared.module.ts
@@ -27,10 +27,11 @@ import {MatSelectModule} from "@angular/material/select";
 import {MatOptionModule} from "@angular/material/core";
 import {MaterialFileInputModule} from "ngx-material-file-input";
 import { FileButtonComponent } from './file-button/file-button.component';
+import { GlobalAlertHandlerComponent } from './components/global-alert-handler/global-alert-handler.component';
 
 
 @NgModule({
-  declarations: [HeaderComponent, EmployeeInfoComponent, LabeledIconComponent, ConfirmBoxComponent, PermissionsListComponent, PermissionsFieldComponent, NavComponent, EntityListComponent, EntityAddComponent, EntityEditComponent, FileButtonComponent],
+  declarations: [HeaderComponent, EmployeeInfoComponent, LabeledIconComponent, ConfirmBoxComponent, PermissionsListComponent, PermissionsFieldComponent, NavComponent, EntityListComponent, EntityAddComponent, EntityEditComponent, FileButtonComponent, GlobalAlertHandlerComponent],
     exports: [
         CommonModule,
         HttpClientModule,
@@ -55,7 +56,8 @@ import { FileButtonComponent } from './file-button/file-button.component';
         EntityListComponent,
         EntityAddComponent,
         EntityEditComponent,
-        FileButtonComponent
+        FileButtonComponent,
+        GlobalAlertHandlerComponent
     ],
   imports: [
     MatTabsModule,
diff --git a/src/app/pages/catalog/catalog.component.ts b/src/app/pages/catalog/catalog.component.ts
index d7c49db..60ca21b 100644
--- a/src/app/pages/catalog/catalog.component.ts
+++ b/src/app/pages/catalog/catalog.component.ts
@@ -1,16 +1,25 @@
-import {Component} from '@angular/core';
-import {NavLink} from "../../modules/shared/components/nav/nav.component";
-import {EmployeePermission} from "../../modules/shared/model/employee";
+import {Component, OnDestroy, OnInit} from '@angular/core'
+import {NavLink} from '../../modules/shared/components/nav/nav.component'
+import {EmployeePermission} from '../../modules/shared/model/employee'
+import {GlobalAlertHandlerComponent} from '../../modules/shared/components/global-alert-handler/global-alert-handler.component'
 
 @Component({
   selector: 'cre-inventory-page',
   templateUrl: './catalog.component.html',
   styleUrls: ['./catalog.component.sass']
 })
-export class CatalogComponent {
+export class CatalogComponent implements OnInit, OnDestroy {
   links: NavLink[] = [
     {route: '/catalog/materialtype', title: 'Types de produit', permission: EmployeePermission.VIEW_MATERIAL_TYPE},
     {route: '/catalog/material', title: 'Produits', permission: EmployeePermission.VIEW_MATERIAL},
     {route: '/catalog/company', title: 'Bannières', permission: EmployeePermission.VIEW_COMPANY}
   ]
+
+  ngOnInit(): void {
+    GlobalAlertHandlerComponent.extraTopMarginMultiplier = 1
+  }
+
+  ngOnDestroy(): void {
+    GlobalAlertHandlerComponent.extraTopMarginMultiplier = 0
+  }
 }
diff --git a/src/custom-theme.scss b/src/custom-theme.scss
index c6a6653..9f41329 100644
--- a/src/custom-theme.scss
+++ b/src/custom-theme.scss
@@ -78,12 +78,44 @@ $theme-accent: mat-palette((
     A700 : #000000,
   )
 ));
+$theme-warning: mat-palette((
+  50 : #fff8e4,
+  100 : #feefbd,
+  200 : #fee491,
+  300 : #fdd964,
+  400 : #fcd043,
+  500 : #fcc822,
+  600 : #fcc21e,
+  700 : #fbbb19,
+  800 : #fbb414,
+  900 : #faa70c,
+  A100 : #ffffff,
+  A200 : #fffaf1,
+  A400 : #ffe6be,
+  A700 : #ffdca4,
+  contrast: (
+    50 : #000000,
+    100 : #000000,
+    200 : #000000,
+    300 : #000000,
+    400 : #000000,
+    500 : #000000,
+    600 : #000000,
+    700 : #000000,
+    800 : #000000,
+    900 : #000000,
+    A100 : #000000,
+    A200 : #000000,
+    A400 : #000000,
+    A700 : #000000,
+  )
+));
 
 // The warn palette is optional (defaults to red).
-$theme-warn: mat-palette($mat-red);
+$theme-error: mat-palette($mat-red);
 
 // Create the theme object (a Sass map containing all of the palettes).
-$color-recipes-explorer-frontend-theme: mat-light-theme($theme-primary, $theme-accent, $theme-warn);
+$color-recipes-explorer-frontend-theme: mat-light-theme($theme-primary, $theme-accent, $theme-error);
 
 // Include theme styles for core and each component used in your app.
 // Alternatively, you can import and @include the theme mixins for each component
@@ -92,7 +124,7 @@ $color-recipes-explorer-frontend-theme: mat-light-theme($theme-primary, $theme-a
 
 $color-primary: map-get($theme-primary, 500);
 $color-accent: map-get($theme-accent, 500);
-$color-warn: map-get($theme-warn, 500);
+$color-warn: map-get($theme-error, 500);
 
 
 html, body {