Flutter NoSuchMethodError：getter'；stringValue'；已使用冻结对null调用

不久前，我又开始了一个项目的工作，我离开后就死了，我在build_runner中遇到了以下错误：

日志终端生成运行程序详细信息：

[WARNING] freezed:freezed on lib/3_domain/workout/workout.dart:
Error NoSuchMethodError: The getter 'stringValue' was called on null.
Receiver: null
Tried calling: stringValue
> [WARNING] freezed:freezed on lib/3_domain/workout/workout.dart:
#0      Object.noSuchMethod (dart:core-patch/object_patch.dart:54:5)
#1      FreezedGenerator._getConstructorRedirectedName (package:freezed/src/freezed_generator.dart:501:23)
<asynchronous suspension>
#2      FreezedGenerator._parseConstructorsNeedsGeneration (package:freezed/src/freezed_generator.dart:219:11)
<asynchronous suspension>
#3      FreezedGenerator.parseElement (package:freezed/src/freezed_generator.dart:76:41)
<asynchronous suspension>
#4      ParserGenerator.generate (package:freezed/src/parse_generator.dart:36:22)
<asynchronous suspension>
#5      _generate (package:source_gen/src/builder.dart:332:23)
<asynchronous suspension>
#6      Stream.toList.<anonymous closure> (dart:async/stream.dart)
<asynchronous suspension>

---

谢谢你的回答

这似乎是冻结的0.12.6中的一个bug，因为我试图降级到冻结的0.12.5并且它可以工作

此外，github中还有一个悬而未决的问题

---

这似乎是冻结的0.12.6中的一个错误，因为我尝试降级到冻结的0.12.5，并且它工作正常

此外，github中还有一个悬而未决的问题

---

谢谢你的回答。我已经尝试降级到0.12.5，但没有多大成功。我也已经启动了颤振升级以防万一。有解决方案吗@QuentinVaucelle AuzelNo我没有找到任何，但我认为这是由于我对依赖项进行了批量更新。但现在，即使回到以前的状态，我也会收到相同的错误消息。我需要好好休息一下，稍后再查。谢谢你的回答。我已经尝试降级到0.12.5，但没有多大成功。我也已经启动了颤振升级以防万一。有解决方案吗@QuentinVaucelle AuzelNo我没有找到任何，但我认为这是由于我对依赖项进行了批量更新。但现在，即使回到以前的状态，我也会收到相同的错误消息。我需要好好休息一下，稍后再查。

import 'package:FitnessAI_MobileApp/3_domain/core/failures.dart';
import 'package:FitnessAI_MobileApp/3_domain/core/value_object.dart';
import 'package:FitnessAI_MobileApp/3_domain/workout/workout_value_objects.dart';
import 'package:dartz/dartz.dart';
import 'package:freezed_annotation/freezed_annotation.dart';

part 'workout.freezed.dart';

@freezed
abstract class Workout implements _$Workout {
  const Workout._();

  const factory Workout({
    @required UniqueId id,
    @required ExerciseList exerciseList,
    @required WorkoutType workoutType,
    //@required List3<TodoItem> todos,
  }) = _Workout;

  /// Empty constructor of any new note
  factory Workout.empty() => Workout(
        id: UniqueId(),
        exerciseList: ExerciseList.empty(),
        workoutType: WorkoutType.init(),
      );

  Option<ValueFailure<dynamic>> get failureOption {
    Option<ValueFailure<dynamic>> exerciseFailureOption;

    if (exerciseList
        .getOrCrash()
        .map(
          (exercise) => exercise.failureOption,
        )
        .where((o) => o.isSome())
        .toList()
        .isEmpty) {
      exerciseFailureOption = none();
    } else {
      exerciseFailureOption = exerciseList
          .getOrCrash()
          .map(
            (exercise) => exercise.failureOption,
          )
          .where((o) => o.isSome())
          .toList()[0];
    }

    return workoutType.failureOrUnit
        .andThen(
          exerciseFailureOption.fold(
            () => right(unit),
            (f) => left(f),
          ),
        )
        .fold(
          (f) => some(f),
          (_) => none(),
        );
  }
}

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