I am trying to switch from Firebase Crash reporting to Firebase Crashlytics.
I have followed the guide here: https://firebase.google.com/docs/crashlytics/upgrade-from-cr
In my case this same error occurred because i already had forced the crash on the device as required by setup tutorial, for a different flavor of the application.
My App has 2 flavors, so in order to successfully link flavor number 2 i had to force crash on a different simulator.
Note: The 2 flavors need to have different packages at least.