Add: closing module on errors

lib/providers/main.dart

@@ -39,6 +39,11 @@ class GymLinkProvider with ChangeNotifier {
   }
 
   void setOnError(void Function() onError) {
-    _onError = onError;
+    _onError = () {
+      _token = '';
+      _isLoading = true;
+      onError();
+      notifyListeners();
+    };
   }
 }