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我正在使用RxDart观察更改并相应地更新UI。应用启动时，我正在进行网络呼叫并成功获取数据，请观察更改并相应地更新UI。但是当我Subjects在关闭屏幕的同时进行配置时。它给出以下错误：

??? EXCEPTION CAUGHT BY WIDGETS LIBRARY ????????????????????????????????????????????????????????????
I/flutter (15524): The following StateError was thrown while finalizing the widget tree:
I/flutter (15524): Bad state: You cannot close the subject while items are being added from addStream

这是bloc类：

class MovieDetailBloc {
  final _repository = Repository();
  final _movieId = PublishSubject<int>();
  final _trailers = BehaviorSubject<Future<TrailerModel>>();

  Function(int) get fetchTrailersById => _movieId.sink.add;
  Observable<Future<TrailerModel>> get movieTrailers => _trailers.stream;

  MovieDetailBloc() {
    _movieId.stream.transform(_itemTransformer()).pipe(_trailers);
  }

  dispose() {
    _movieId.close();
    _trailers.close();
  }

  _itemTransformer() {
    return ScanStreamTransformer(
      (Future<TrailerModel> trailer, int …