yeah, I'm in the same situation, I need to reset the game, but I'm not really sure if it is a problem from the mod, or the game itself, if it is from the game itself then there is nothing we can do.
You can only log in with a facebook account, these are the steps:
First unistall the mod game, and install the original game from the game store.
Log in to the game like you normally do with your google account.
Once you are in the game, go to settings (clicking the image of your character)...
Does anybody have problems with buttons? like for example you touch on play and it won't start the fight, or you touch a place on the map and it does nothing?