@Vron54: Check the Google Play Store for any available updates for the app which might be required to access it. Further to the above, please head to Settings > Apps > Gummy Drop > Storage > Clear cache. This won't affect your personal data, although selecting 'Clear data' will. I'm not familiar with the app, so I'm not sure how much of your user profile is stored on the device, and how much is stored in the cloud, so I would advise that you avoid clearing the app data for now.
