Android Question Firebase Notifications

I am trying to install Firebase notifications, I have done it on other occasions, but can no longer.

I have followed this tutorial...
https://www.b4x.com/android/forum/threads/integrating-firebase-services.67692/

Convert byte code - optimized dex. Error
Uncaught translation error: java.lang.IllegalArgumentException: already added: Lcom/google/android/gms/internal/measurement/zzu;

Click to expand...

I have even reinstalled everything, following the instructions and nothing...
https://www.b4x.com/b4a.html