There must be something wrong with your Google Play Game app settings because Farm Heroes Saga Mod APK is most likely trying to sync with that service (and failing). To fix this go into "Settings" and click on "Apps". Then search for "Google Play Games" and press uninstall updates. Once that's done restart your device and then reinstall the updates for Google Play Games. Now start downloading updates again but don't install them until you are asked to! After that's done, keep playing and everything should work fine.