cannot find symbol BuildConfig FlutterFirebaseCoreRegistrar
I updated a 2 year old flutter-project and get the following error at debugging. I need help. I tried to fix the error for 4 days. Launching lib/main.dart on sdk gphone x86 in debug mode... /Users/michael/.pub-cache/hosted/pub.dev/firebase_core-2.24.2/android/src/main/java/io/flutter/plugins/firebase/core/FlutterFirebaseCoreRegistrar.java:19: error: cannot find symbol…