Java.Lang.IllegalStateException: Default FirebaseApp is not initialized in this process TestChartApp.TestChartApp. Make sure to call FirebaseApp.initializeApp(Contex
The resolution for me was toggling the BuildAction for the google-services.json to GoogleServicesJson.
Even though the google-services.json properties showed BuildAction set to GoogleServicesJson, I was still having the error "Default FirebaseApp is not initialized in this process Make sure to call FirebaseApp.initializeApp(Context) first".
I was able to resolve this issue by setting BuildAction to "None" then setting it back to "GoogleServicesJson". When I got latest version from source control the BuildAction must not have carried over to my local copy (although it showed as such).