diff --git a/packages/context/src/lib/context-manager/shared/context.service.ts b/packages/context/src/lib/context-manager/shared/context.service.ts
index 0bf5dbc16d..d123d49d95 100644
--- a/packages/context/src/lib/context-manager/shared/context.service.ts
+++ b/packages/context/src/lib/context-manager/shared/context.service.ts
@@ -1,5 +1,5 @@
 import { Injectable, Optional } from '@angular/core';
-import { HttpClient } from '@angular/common/http';
+import { HttpClient, HttpErrorResponse } from '@angular/common/http';
 
 import { BehaviorSubject, Observable, of } from 'rxjs';
 import { map, tap, catchError, debounceTime, flatMap } from 'rxjs/operators';
@@ -93,7 +93,9 @@ export class ContextService {
     const url = `${this.baseUrl}/contexts/${id}/details`;
     return this.http
       .get<DetailedContext>(url)
-      .pipe(catchError(res => this.handleError(res, id)));
+      .pipe(catchError(res => {
+        return this.handleError(res, id)
+      }));
   }
 
   getDefault(): Observable<DetailedContext> {
@@ -181,16 +183,17 @@ export class ContextService {
     contextId: string,
     profil: string,
     type: TypePermission
-  ): Observable<ContextPermission[]> {
+  ): Observable<ContextPermission[] | Message[]> {
     const url = `${this.baseUrl}/contexts/${contextId}/permissions`;
     const association = {
       profil,
       typePermission: type
     };
-    return this.http.post<ContextPermission[]>(
-      url,
-      JSON.stringify(association)
-    );
+
+    return this.http.post<ContextPermission[]>(url, JSON.stringify(association))
+      .pipe(catchError(res => {
+        return [this.handleError(res, undefined, true)]
+      }));
   }
 
   deletePermissionAssociation(
@@ -471,19 +474,30 @@ export class ContextService {
     return `${basePath}/${file}`;
   }
 
-  private handleError(res: Response, uri: string): Message[] {
+  private handleError(error: HttpErrorResponse, uri: string, permissionError?: boolean): Message[] {
     const context = this.contexts$.value.ours.find(obj => obj.uri === uri);
     const titleContext = context ? context.title : uri;
-    const titleError = this.languageService.translate.instant(
+    error.error.title = this.languageService.translate.instant(
       'igo.context.contextManager.invalid.title'
     );
 
-    const textError = this.languageService.translate.instant(
+    error.error.message = this.languageService.translate.instant(
       'igo.context.contextManager.invalid.text',
       { value: titleContext }
     );
 
-    throw [{ title: titleError, text: textError }];
+    error.error.toDisplay = true;
+
+    if (permissionError) {
+      error.error.title = this.languageService.translate.instant(
+        'igo.context.contextManager.errors.addPermissionTitle'
+      );
+      error.error.message = this.languageService.translate.instant(
+        'igo.context.contextManager.errors.addPermission'
+      );
+    }
+
+    throw error;
   }
 
   private handleContextsChange(
diff --git a/packages/context/src/locale/en.context.json b/packages/context/src/locale/en.context.json
index 45bd85d6b8..4346b773b3 100644
--- a/packages/context/src/locale/en.context.json
+++ b/packages/context/src/locale/en.context.json
@@ -29,7 +29,9 @@
           "uncaught": {
             "message": "Sorry, service is currently not available. Please try again later",
             "title": "Error server"
-          }
+          },
+          "addPermission": "The permission you are trying to add is already in the context.",
+          "addPermissionTitle": "Add permission error"
         },
         "favorite": "Favorite",
         "form": {
diff --git a/packages/context/src/locale/fr.context.json b/packages/context/src/locale/fr.context.json
index 077537eca1..e1c980089b 100644
--- a/packages/context/src/locale/fr.context.json
+++ b/packages/context/src/locale/fr.context.json
@@ -29,7 +29,9 @@
           "uncaught": {
             "message": "Désolé! Le service que vous voulez utiliser n’est malheureusement pas disponible pour le moment. Essayez plus tard!",
             "title": "Erreur de serveur"
-          }
+          },
+          "addPermission": "La permission que vous tentez d'ajouter est déjà présente dans le contexte.",
+          "addPermissionTitle": "Erreur d'ajout de permission"
         },
         "favorite": "Favori",
         "form": {