`flutter pub get` results in build runner error

Question

I got this error out of the blue in Flutter mobile. When trying to run "flutter run" or "flutter pub get", I get this error

Because mapstest depends on build runner any which doesn't exist (could not find package build runner at https://pub.flutter-io.cn), version solving failed.

I tried fixing my proxy setting and it's all good I think. I tried downgrading flutter still doesn't work. flutter doctor is all good. I tried searching this error but no similar results gave me this.

Solution

You are using the wrong version of build_runner. Just run this command in the terminal :

dart pub add build_runner --dev

and then run this :

flutter pub run build_runner build

Comments

[Kim Lo]

added this to my dev_dependencies: build runner: ^2.1.8. but still doesnt work with same error :(

[Evgen]

Nothing changed?