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Error: The argument type 'Null Function(DataSnapshot)' can't be assigned to the parameter type 'FutureOr&lt;dynamic&gt; Function(DatabaseEvent)'.
 - 'DataSnapshot' is from 'package:firebase_database/firebase_database.dart' ('/C:/src/flutter/flutter/.pub-cache/hosted/pub.dartlang.org/firebase_database-9.0.16/lib/firebase_database.dart').
 - 'DatabaseEvent' is from 'package:firebase_database/firebase_database.dart' ('/C:/src/flutter/flutter/.pub-cache/hosted/pub.dartlang.org/firebase_database-9.0.16/lib/firebase_database.dart').
       usersRef.child(firebaseUser.uid).once().then( (DataSnapshot snap){