You might get this error because:
- The time on your device is incorrect, go to Settings >> Date & Time, then check and correct the date, time according to your timezone
- There may be errors while updating new version, try to delete game, delete cache and reinstall it. Check the How to delete game.
- Game may crashed because of running apps on your device, try restarting devices then reopen game.
- Because this game does not fit your device or device graphic is not enough to run the game. Please read the confiuration requirements carefully in game description on App Store or Google Play to make sure your device can run this game. Or you can install the game on another device.