1. Check your internet connection and make sure that it is stable.
2. Secure enough space on your device by deleting some apps that you no longer use.
3. Quit all apps running in the background.
4. Restart your device.
* Please take note that if you will reinstall the game please make sure that your game data is synced to a Facebook account to avoid data loss.
If the steps above don’t work, please contact us through customer support: [customer center link].