What does signInResult:failed code=12500 error mean in AndroidStudio?

Question

android studio

Hello, I would like to register in the application. Made MainActivity with LayoutDrawerActyvity. As well as AuthActivity, where the authorization process takes place. In MainActivity, in the onCreate method, I registered the start of AuthActivity. And now after authorization it always throws on AuthActivity. tell me, please, how can I fix this? I did everything according to the documentation from Google . Error in logs: signInResult:failed code=12500