Flutter expert

I need a flutter expert to fix below error
Error: Cannot run with sound null safety, because the following dependencies
don't support null safety:

- package:cloud_firestore_web
- package:firebase_core_web
- package:shared_preferences
- package:url_launcher_web
- package:firebase_auth
- package:http
- package:provider
...

For solutions, see https://dart.dev/go/unsound-null-safety
Failed to compile application.