无法使用转换JetifyTransform解决依赖关系？

错误:

Unable to resolve dependency for ':app@debug/compileClasspath': Failed to 
transform file 'billing-1.0.aar' to match attributes {artifactType=jetified- 
aar} using transform JetifyTransform

bloc.dart

class Bloc{
Bloc(){
additionalController.stream.listen(onAdd);
}

void dispose() async {
additionalController.close();
_itemAdd.close();
}

final additionalController = StreamController<Data>();
Sink<Data> get addItem => additionalController.sink;

Stream<String> get addGet => _itemAdd.stream;
final _itemAdd = BehaviorSubject<String>();

void onAdd(Data data) {
_addWork(data);
}

Future<Null> _addWork(Data data) async {

//work

}).whenComplete(() {

_itemAdd.add("complete work");

}).catchError((e) {
_itemAdd.addError("Error in Adding Data");
  });
 }
}

由于bloc只能使用和共享来处理业务逻辑,但错误处理部分无关,与业务逻辑.

如何在UI上显示回调和bloc错误.我认为不是StreamBuilder唯一的解决方案.

如果我们使用StreamBuilder,那么,每次重建发生时我们都会重复发送回调给bloc,这没有任何意义.

有没有正确的方法来做到这一点？

先感谢您!!