Why is Fabric not initialized? java.lang.IllegalStateException: Must Initialize Fabric before using singleton()

Question

I set up Firebase Crashlytics according to Get started with Firebase Crashlytics for my Android app (using Android studio 3.1.3). On my own device as well as on the Emulator, ev

Answer 1

I get this exception when migrated from Fabric to FirebaseCrashlytics. I didn't remove

  // Remove the Fabric Crashlytics SDK.
  implementation 'com.crashlytics.sdk.android:crashlytics:2.10.1'

And I did not update code:

Crachlytics.log(..

Should became

FirebaseCrashlytics.getInstance().log(...

Actually just follow everything in this document Upgrade to the Firebase Crashlytics SDK