diff --git a/src/core/login/providers/helper.ts b/src/core/login/providers/helper.ts
index 844c446fa..86b99c7ba 100644
--- a/src/core/login/providers/helper.ts
+++ b/src/core/login/providers/helper.ts
@@ -14,7 +14,7 @@
 
 import { Injectable } from '@angular/core';
 import { Location } from '@angular/common';
-import { Platform } from 'ionic-angular';
+import { Platform, AlertController } from 'ionic-angular';
 import { TranslateService } from '@ngx-translate/core';
 import { CoreAppProvider } from '@providers/app';
 import { CoreConfigProvider } from '@providers/config';
@@ -83,7 +83,7 @@ export class CoreLoginHelperProvider {
             private eventsProvider: CoreEventsProvider, private appProvider: CoreAppProvider, private utils: CoreUtilsProvider,
             private urlUtils: CoreUrlUtilsProvider, private configProvider: CoreConfigProvider, private platform: Platform,
             private initDelegate: CoreInitDelegate, private sitePluginsProvider: CoreSitePluginsProvider,
-            private location: Location) {
+            private location: Location, private alertCtrl: AlertController) {
         this.logger = logger.getInstance('CoreLoginHelper');
     }
 
@@ -924,6 +924,41 @@ export class CoreLoginHelperProvider {
             (!CoreConfigConstants.skipssoconfirmation || String(CoreConfigConstants.skipssoconfirmation) === 'false');
     }
 
+    /**
+     * Show a modal warning the user that he should use the Classic app.
+     *
+     * @param {string} message The warning message.
+     */
+    protected showLegacyNoticeModal(message: string): void {
+        const isAndroid = this.platform.is('android'),
+            isIOS = this.platform.is('ios'),
+            buttons: any[] = [
+                {
+                    text: this.translate.instant('core.ok'),
+                    role: 'cancel'
+                }
+            ];
+
+        if (isAndroid || isIOS) {
+            buttons.push({
+                text: this.translate.instant('core.download'),
+                handler: (): void => {
+                    const link = isAndroid ? 'market://details?id=com.moodle.classic' :
+                            'itms-apps://itunes.apple.com/app/id1403448117';
+
+                    this.utils.openInBrowser(link);
+                }
+            });
+        }
+
+        const alert = this.alertCtrl.create({
+                message: message,
+                buttons: buttons
+            });
+
+        alert.present();
+    }
+
     /**
      * Function called when site policy is not agreed. Reserved for core use.
      *
@@ -961,6 +996,8 @@ export class CoreLoginHelperProvider {
     treatUserTokenError(siteUrl: string, error: any): void {
         if (error.errorcode == 'forcepasswordchangenotice') {
             this.openChangePassword(siteUrl, error.error || error.message || error.body || error.content);
+        } else if (error.errorcode == 'legacymoodleversion') {
+            this.showLegacyNoticeModal(error.error);
         } else {
             this.domUtils.showErrorModal(error);
         }
diff --git a/src/providers/sites.ts b/src/providers/sites.ts
index c3e8678bb..e7239b659 100644
--- a/src/providers/sites.ts
+++ b/src/providers/sites.ts
@@ -494,9 +494,15 @@ export class CoreSitesProvider {
                     return siteId;
                 });
             } else if (result == this.LEGACY_APP_VERSION) {
-                return Promise.reject(this.translate.instant('core.login.legacymoodleversion'));
+                return Promise.reject({
+                    error: this.translate.instant('core.login.legacymoodleversion'),
+                    errorcode: 'legacymoodleversion'
+                });
             } else {
-                return Promise.reject(this.translate.instant('core.login.invalidmoodleversion'));
+                return Promise.reject({
+                    error: this.translate.instant('core.login.invalidmoodleversion'),
+                    errorcode: 'invalidmoodleversion'
+                });
             }
         });
     }