FireBase Error: cannot access zzanb class file for com.google.android.gms.internal.zzanb not found

You're mixing libraries from old and new Firebase released. Everything from Firebase that you use should be in parity. This line is reference an library from a very old Firebase release (before it became the Firebase platform at Google):

compile 'com.firebaseui:firebase-ui:0.6.0'

If you want to use the Firebase-UI library, you should use the new version of it that matches the version of the main client library you're using. You're using 10.0.1, so according to the table on the Firebase-UI github I just linked, you want this dependency:

compile 'com.firebaseui:firebase-ui:1.1.1'

Always make sure your Firebase-UI library matches the core Firebase SDK you're using.