Cannot access zzbql in Firebase

Upgrade your firebase for version 10.2.0

** As of 07.11.2017 it's 11.6.0

The answer to solve the problem really is upgrading Firebase to 10.2.0 as in @DenerRocha 's reply.

But you might get the same problem again next time google-play-services is updated. The problem is that the compiler warns you that there's a new google-play services version, but doesn't do the same for Firebase. So keep the following in mind:

When you have this:

compile 'com.google.android.gms:play-services-auth:10.2.0'

Your Firebase will be:

compile 'com.google.firebase:firebase-core:10.2.0'
compile 'com.google.firebase:firebase-messaging:10.2.0'
compile 'com.google.firebase:firebase-auth:10.2.0'

When 10.3.0 is release, you'll have to update all of them to 10.3.0