Flutter run command
Output
Could not resolve the package 'characters' in 'package:characters/characters.dart'.
flutter doctor
[✓] Android toolchain - develop for Android devices (Android SDK version 29.0.3)
[✓] Chrome - develop for the web
[✓] Android Studio (version 4.0)
[✓] VS Code (version 1.47.2)
[✓] Connected device (3 available)
I faced this error too while updating Flutter today to Flutter Channel beta, 1.20.0-7.2.pre for an existing project.
As mentioned in https://github.com/flutter/flutter/issues/59645#issuecomment-645236663 running: flutter clean solved the problem.
This actually deletes the .dart_tool plus a few other files.
It could just be an issue with flutter's cache.
Run flutter clean to clear your cache.
I faced with this Error today (when i updated to Flutter 1.20.0-7.2.pre • channel beta) and finaly i solved it with deleting the .dart_tool (location: ../yourProject/.dart_tool) folder in my project and run my project again.
I don't want to repeat the same solution as it is already been given: Yes, 'flutter clean' does the job cleaning the unused files from the previous version. I though have a habit to run this command periodically and upon each upgrade to keep clearing the cache. And for the past 2 years, I am not facing such issues.
Run these commands and hopefully your problem will be solved:
flutter pub cache repair
or
flutter clean
then try to run it with
flutter run
command
As suggested in Flutter Issues on GitHub run the following commands:
flutter pub cache repair
flutter clean