颤动：未处理的异常：错误状态：调用关闭后无法添加新事件

如果错误实际上是由您发布的代码引起的，那么我将添加一个检查以确保在

dispose()

class ServiceBloc extends MainBloc {  final _repo = new Repo();  final PublishSubject<ServiceModel> _serviceController =      new PublishSubject<ServiceModel>();  Observable<ServiceModel> get allServices => _serviceController.stream;  getAllServices() async {    // do nothing if already disposed    if(_isDisposed) {      return;    }    appIsLoading();    ServiceModel movieItem = await _repo.getAllServices();    _serviceController.sink.add(movieItem);    appIsNotLoading();  }  bool _isDisposed = false;  void dispose() {    _serviceController.close();    _isDisposed = true;  }}ServiceBloc serviceBloc = new ServiceBloc();