Failed to load module descriptor class: Didn't find class "com.google.android.gms.dynamite.descriptors.com.google.firebase.auth.ModuleDescriptor"

Alfonso from the Firebase team.

You can ignore the error E/DynamiteModule: Failed to load module descriptor class: Didn't find class "com.google.android.gms.dynamite.descriptors.com.google.firebase.auth.ModuleDescriptor": unfortunately there is a bug in Play Services where this is logged as E/ rather than debug. We will deploy the fix on the next release.

This should not affect the behavior of your application, if you have an issue, look for the cause somewhere else.

Make sure the password you're putting is not less than 6 characters! :)

I forget this auth=FirebaseAuth.getInstance();

It gave me same error and after adding these code helped get rid of from that error.