Show Error when Login not possible

app/src/main/java/core/notevault/MainActivity.java

@@ -257,6 +257,7 @@ public class MainActivity extends AppCompatActivity implements MetaDataDialog.On
 
     @Override
     public void onError(String error) {
-
+        Toast.makeText(this, error, Toast.LENGTH_LONG).show();
+        Log.d("LoginError", error);
     }
 }