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();