问题：Logger.onLevelChanged

[JieHaoCai]

Failed to build json_model:json_model:
../../AppData/Local/Pub/Cache/hosted/pub.flutter-io.cn/build_runner_core-7.2.2/lib/src/logging/build_for_input_logger.dart:13:7: Error: The non-abstract class 'BuildForInputLogger' is missing implementations for th
ese members:

• Logger.onLevelChanged
  Try to either
• provide an implementation,
• inherit an implementation from a superclass or mixin,
• mark the class as abstract, or
• provide a 'noSuchMethod' implementation.

class BuildForInputLogger implements Logger {
^^^^^^^^^^^^^^^^^^^
../../AppData/Local/Pub/Cache/hosted/pub.flutter-io.cn/logging-1.2.0/lib/src/logger.dart:162:22: Context: 'Logger.onLevelChanged' is defined here.
Stream<Level?> get onLevelChanged {
^^^^^^^^^^^^^^
../../AppData/Local/Pub/Cache/hosted/pub.flutter-io.cn/build_runner-2.1.11/lib/src/build_script_generate/bootstrap.dart:76:40: Error: Method not found: 'NullThrownError'.
final error = e[0] as Object? ?? NullThrownError();

[JieHaoCai]

dev_dependencies:
flutter_lints: ^2.0.0
json_model: ^1.0.0
json_serializable: ^5.0.0

[pingia]

dev_dependencies: flutter_lints: ^2.0.0 json_model: ^1.0.0 json_serializable: ^5.0.0

I resolved the same error by following the below link:
dart-lang/build#3519 (comment)

[Zhoulive]

Terminal Command:
1.dart pub upgrade
2.dart pub outdated
3.dart pub upgrade --major-versions
4.flutter packages pub run json_model
or (dart run json_mode)

[sayLX]

because the version of logging in your project is incompatible with the version used by json_model, you should specify the logging version.

just do it follow this：

1. delete pubspec.lock

2. add dependencies
   logging: ^1.0.1

3. flutter pub get