ClassNotFoundException for SignInConfiguration when signing in with Google

Question

I\'m implementing Google login to an app. The login itself seems to work okay, but the moment I request either the user\'s e-mail or ID token I see the following stack trace

Answer 1

I got this issue fixed in this way: I deleted my project the google developer console, and created another one with a different name, also I changed my package name almost completely: for example from com.example.android.appname to com.y.android.anothername. Then I generated signed apk with my previous certificate and google signing worked without giving me that error.