Yesterday,my app was working fine.
Today, I don\'t know why, the app didn\'t compile anymore after I reopened the Android Studio.
The error shown is
Ok, wait a second. I've verified that not all Firebase libraries need that version. The versions are now misaligned. In fact on the official page reports that some are at 15.1.0 instead of 15.0.2;
Maybe see directly here if it can be useful:
https://firebase.google.com/docs/android/setup