Just go to Google Play games settings and log out of all games. Then disable Google Play auto login to all supported games. Now the mod will work without any issues. Enjoy!
You have to go to Google Play games settings and log out of all games. Then uncheck the option that says log in automatically to all supported games. After that the error message will go away. Works for me.
The signed apk works fine. We just have to go to Google Play games settings and log out of all games. Then uncheck the option that says automatically login to all supported games. After that the game runs fine.
Request you to please provide updates with signed apk in the future.