Error: Method not found: '$checkedCreate'

[vishalrao8]

On running the build runner command I am getting these errors.

My dev dependencies are:

dev_dependencies:
  flutter_test:
    sdk: flutter
  build_runner: ^2.1.4
  flutter_gen_runner: ^4.0.0
  lint: ^1.7.2
  import_sorter: ^4.6.0

Flutter doctor result:

Doctor summary (to see all details, run flutter doctor -v):
[√] Flutter (Channel stable, 2.5.3, on Microsoft Windows [Version 10.0.19043.1288], locale en-IN)
[√] Android toolchain - develop for Android devices (Android SDK version 30.0.3)
[√] Android Studio (version 2020.3)
[√] VS Code (version 1.61.1)

Commands tried:

flutter clean
flutter pub get
flutter pub global activate flutter_gen
flutter pub run build_runner build --delete-conflicting-outputs

flutter pub global activate flutter_gen

Package flutter_gen is currently active at version 4.0.0.
Resolving dependencies...
The package flutter_gen is already activated at newest available version.
To recompile executables, first run `global deactivate flutter_gen`.
Installed executable fluttergen.
Activated flutter_gen 4.0.0.

[lcdsmao]

Hi @vishalrao8
Can you show the version of json_annotation in your pubspec.lock file?
The $checkedCreate was introduced by json_annotation (>= 4.1.0) and it should be brought as the transitive dependency by flutter_gen_runner.

flutter_gen/example/pubspec.lock

Lines 294 to 300 in e8927c0

	json_annotation:
	dependency: transitive
	description:
	name: json_annotation
	url: "https://pub.dartlang.org"
	source: hosted
	version: "4.1.0"

[vishalrao8]

  json_annotation:
    dependency: transitive
    description:
      name: json_annotation
      url: "https://pub.dartlang.org"
    source: hosted
    version: "4.0.1"

[vishalrao8]

Overriding dependency with the latest version fixed the issue but why transitive dependency didn't have the latest version by default?

  json_annotation:
    dependency: "direct overridden"
    description:
      name: json_annotation
      url: "https://pub.dartlang.org"
    source: hosted
    version: "4.3.0"

[lcdsmao]

Oh, I see:

flutter_gen/packages/core/pubspec.yaml

Line 21 in e8927c0

json_annotation: '>=4.0.0 <5.0.0'

Our dependency specify is bad.
We should fix that.

@vishalrao8
Thanks for your report!