diff --git a/src/addon/mod/resource/components/index/index.ts b/src/addon/mod/resource/components/index/index.ts
index 2304a319e..2c1283958 100644
--- a/src/addon/mod/resource/components/index/index.ts
+++ b/src/addon/mod/resource/components/index/index.ts
@@ -15,6 +15,7 @@
 import { Component, Injector } from '@angular/core';
 import { CoreAppProvider } from '@providers/app';
 import { CoreSitesProvider } from '@providers/sites';
+import { CoreUtilsProvider } from '@providers/utils/utils';
 import { CoreCourseProvider } from '@core/course/providers/course';
 import { CoreCourseModuleMainResourceComponent } from '@core/course/classes/main-resource-component';
 import { AddonModResourceProvider } from '../../providers/resource';
@@ -38,7 +39,8 @@ export class AddonModResourceIndexComponent extends CoreCourseModuleMainResource
 
     constructor(injector: Injector, private resourceProvider: AddonModResourceProvider, private courseProvider: CoreCourseProvider,
             private appProvider: CoreAppProvider, private prefetchHandler: AddonModResourcePrefetchHandler,
-            private resourceHelper: AddonModResourceHelperProvider, private sitesProvider: CoreSitesProvider) {
+            private resourceHelper: AddonModResourceHelperProvider, private sitesProvider: CoreSitesProvider,
+            private utils: CoreUtilsProvider) {
         super(injector);
     }
 
@@ -78,7 +80,7 @@ export class AddonModResourceIndexComponent extends CoreCourseModuleMainResource
         // Load module contents if needed. Passing refresh is needed to force reloading contents.
         return this.courseProvider.loadModuleContents(this.module, this.courseId, null, false, refresh).then(() => {
             if (!this.module.contents || !this.module.contents.length) {
-                return Promise.reject(null);
+                return Promise.reject(this.utils.createFakeWSError('core.filenotfound', true));
             }
 
             // Get the resource instance to get the latest name/description and to know if it's embedded.
diff --git a/src/assets/lang/en.json b/src/assets/lang/en.json
index 8fd9e1499..8e7ff5128 100644
--- a/src/assets/lang/en.json
+++ b/src/assets/lang/en.json
@@ -1342,6 +1342,7 @@
     "core.favourites": "Starred",
     "core.filename": "Filename",
     "core.filenameexist": "File name already exists: {{$a}}",
+    "core.filenotfound": "File not found, sorry.",
     "core.fileuploader.addfiletext": "Add file",
     "core.fileuploader.audio": "Audio",
     "core.fileuploader.camera": "Camera",
diff --git a/src/core/course/providers/helper.ts b/src/core/course/providers/helper.ts
index aa57300b6..a79546849 100644
--- a/src/core/course/providers/helper.ts
+++ b/src/core/course/providers/helper.ts
@@ -528,7 +528,7 @@ export class CoreCourseHelperProvider {
         // Make sure that module contents are loaded.
         return promise.then(() => {
             if (!files || !files.length) {
-                return Promise.reject(null);
+                return Promise.reject(this.utils.createFakeWSError('core.filenotfound', true));
             }
 
             return this.sitesProvider.getSite(siteId);
diff --git a/src/lang/en.json b/src/lang/en.json
index 3df5da21b..27e5e170f 100644
--- a/src/lang/en.json
+++ b/src/lang/en.json
@@ -95,6 +95,7 @@
     "favourites": "Starred",
     "filename": "Filename",
     "filenameexist": "File name already exists: {{$a}}",
+    "filenotfound": "File not found, sorry.",
     "folder": "Folder",
     "forcepasswordchangenotice": "You must change your password to proceed.",
     "fulllistofcourses": "All courses",