1. Check for updates to the app.
2.
If you can open the app, touch or > Help and look for troubleshooting information.
3. Turn your phone off and then on again.
4. Clear the app's cache.
Gmail problems
For help with Gmail, read Google's troubleshooting information.
Play Store problems
For help with Play Store, read Google's troubleshooting information.
Fix a problem : App issues 212