memo.txt

flutter pub get 
flutter pub run build_runner build --delete-conflicting-outputs
flutter analyze
flutter pub publish
==== https://docs.flutter.dev/reference/flutter-cli

=================================================Here’s how you might use the flutter tool to create, analyze, test, and run an app:
flutter create my_app
cd my_app
flutter analyze
flutter test
flutter run lib/main.dart
=================================================To run pub commands using the flutter tool:
flutter pub get
flutter pub outdated
flutter pub upgrade
=================================================
 flutter --help --verbose
 flutter --version
======================================================Show information about the installed tooling.
flutter doctor
======================================================Runs Flutter Driver tests for the current project.
flutter drive
======================================================List, launch and create emulators.
flutter emulators	
======================================================Upgrade your copy of Flutter.
flutter upgrade	

======================================================you can solve this running below commands. Not all the time chatgpt gives you rigth answer.
flutter clean
flutter pub upgrade
flutter pub get