Getting Exception java.lang.NoClassDefFoundError: com.google.firebase.FirebaseOptions after updating to the new firebase

Question

I have updated my application to the new firebase using the this and now when i compile my project i get the following exception.

Here is my logcat:

Answer 1

 GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
            .requestIdToken(getString(**R.string.default_web_client_id**))
            .requestEmail()
            .build();

In my same case i changed requestIdToken and it worked.