你好，我的代码如下：

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),
    );
  }
}

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我收到这个错误：未处理的异常：不良状态：add（CheckIfFavoriteMovieEvent）在没有注册事件处理程序的情况下被调用。请确保通过on（（event，emit）{...}）注册处理程序
如果你能帮助我解决我写的这个错误，我将非常感激。非常感谢现在帮助我的每一个人
我使用了许多人工智能工具来解决问题，但它并没有给予我想要的解决方案。