Runtime display error with Dart v2

[Soundbytes]

compiling and running the app under Dart2 gave me a red screen on the device with the message

type '_BroadcastStream' is not a subtype of type 'Stream<List>'

It seems the error can be fixed by repacing line 7 in file lib/favorites_manager.dart

StreamController _favStreamController = new StreamController.broadcast();

with:

StreamController<List<Favorite>> _favStreamController = new StreamController<List<Favorite>>.broadcast();

(Dart2 is more rigid with type checking than Dart1)

[rakshetha]

there seem to be more
...VERBOSE-2:shell.cc(181)] Dart Error: Unhandled exception:
type '_BroadcastSubscription' is not a subtype of type 'StreamSubscription'
#0 _MyHomePageState._addFavorite (file:///Users/macsetup/Documents/myGIT/flutter_map_demo/lib/main.dart:92:5)
#1 _AsyncAwaitCompleter.start (dart:async/runtime/libasync_patch.dart:49:6)
#2 _MyHomePageState._addFavorite (file:///Users/macsetup/Documents/myGIT/flutter_map_demo/lib/main.dart:78:22)
#3 _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:503:14)
#4 _InkResponseState.build. (package:flutter/src/material/ink_well.dart:558:30)
#5 GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:102:24)
#6 TapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:242:9)
#7 TapGestureRecognizer.handlePrimaryPointer (package:flutter/src/gestures/tap.dart:175:7)
#8 PrimaryPointerGestureRecognizer.handleEvent (package:flutter/src/gestu<…>
[4.1 3CE48A93-077D-4470-9E90-554BF2FEE0A0 10.55.13.32.52831<->216.58.205.238:443]
Connected Path: satisfied (Path is satisfied), interface: en0
Duration: 76.981s, DNS @0.001s took 0.003s, TCP @0.008s took 0.014s, TLS took 0.052s
bytes in/out: 43405/7678, packets in/out: 64/37, rtt: 0.051s, retransmitted packets: 3, out-of-order packets: 15