These look pretty common though. I’ve seen people post similar errors.
What if you create a new flutter project? eg
flutter create hello_world
cd hello_world
flutter run
This should build a folder structure for a flutter app with an updated gradle and all dependencies.
Does this run? If no then something might be wrong with the installation.
If yes, then copy content from these folders into your folder structure.
And run again.
Let me know if it works (or not) 