Flutter 确保通过在CheckIfFavoriteMovieEvent((event，emit){...})上注册处理程序误差

日安，我的代码如下所示:

class FavoriteBloc extends Bloc<FavoriteEvent, FavoriteState> {
  final SaveMovie saveMovie;
  final GetFavoriteMovies getFavoriteMovies;
  final DeleteFavoriteMovie deleteFavoriteMovie;
  final CheckIfFavoriteMovie checkIfFavoriteMovie;

  FavoriteBloc({
    required this.saveMovie,
    required this.getFavoriteMovies,
    required this.deleteFavoriteMovie,
    required this.checkIfFavoriteMovie,
  }) : super(FavoriteInitial());

  @override
  Stream<FavoriteState> mapEventToState(
      FavoriteEvent event,
      ) async* {
    if (event is ToggleFavoriteMovieEvent) {
      if (event.isFavorite) {
        await deleteFavoriteMovie(MovieParams(event.movieEntity.id));
      } else {
        await saveMovie(event.movieEntity);
      }
      final response =
      await checkIfFavoriteMovie(MovieParams(event.movieEntity.id));
      yield response.fold(
            (l) => FavoriteMoviesError(),
            (r) => IsFavoriteMovie(r),
      );
    } else if (event is LoadFavoriteMovieEvent) {
      yield* _fetchLoadFavoriteMovies();
    } else if (event is DeleteFavoriteMovieEvent) {
      await deleteFavoriteMovie(MovieParams(event.movieId));
      yield* _fetchLoadFavoriteMovies();
    } else if (event is CheckIfFavoriteMovieEvent) {
      final response = await checkIfFavoriteMovie(MovieParams(event.movieId));
      yield response.fold(
            (l) => FavoriteMoviesError(),
            (r) => IsFavoriteMovie(r),
      );
    }
  }

  Stream<FavoriteState> _fetchLoadFavoriteMovies() async* {
    final Either<AppError, List<MovieEntity>> response =
    await getFavoriteMovies(NoParams());

    yield response.fold(
          (l) => FavoriteMoviesError(),
          (r) => FavoriteMoviesLoaded(r),
    );
  }
}

我收到了这个错误: Unhandled Exception: Bad state: add(CheckIfFavoriteMovieEvent) was called without a registered event handler. Make sure to register a handler via on((event, emit) {...})个

如果你能帮助我解决我写的这个错误，我将不胜感激.非常感谢现在帮助我们的每一个人

我用了很多人工智能工具来解决这个问题，但它没有给我想要的解决方案.