Destroy method about flutter_janus_client HOT 7 CLOSED

  Future prepareTranscievers(bool offer) async {
    RTCRtpTransceiver audioTransceiver;
    RTCRtpTransceiver videoTransceiver;
    // here
    var transceivers = **await** _webRTCHandle.pc.transceivers;

...
        event.track.onEnded = () async {
          if (webRTCHandle.remoteStream != null) {
            webRTCHandle.remoteStream.removeTrack(event.track);
            var mid = event.track.id;
            // ======> from this
            var transceiverRaw = await peerConnection.transceivers;
            var transceiver = transceiverRaw.firstWhere((element) => element.receiver.track == event.track);
            // ======> to this
            mid = transceiver.mid;
            plugin.onRemoteTrack(event.streams[0], event.track, mid, false);
          }
        };
        event.track.onMute = () async {
          if (webRTCHandle.remoteStream != null) {
            webRTCHandle.remoteStream.removeTrack(event.track);
            var mid = event.track.id;
            // ======> from this
            var transceiverRaw = await peerConnection.transceivers;
            var transceiver = transceiverRaw.firstWhere((element) => element.receiver.track == event.track);
            // ======> to this
            mid = transceiver.mid;
            plugin.onRemoteTrack(event.streams[0], event.track, mid, false);
          }
        };
...

../../Library/flutter/.pub-cache/git/flutter_janus_client-ca276fd4942bf2e533883699a1a32e0aaeed2f08/lib/Plugin.dart:308:46: Error: The getter 'length' isn't defined for the class 'Future<List<RTCRtpTransceiver>>'.
 - 'Future' is from 'dart:async'.
 - 'List' is from 'dart:core'.
 - 'RTCRtpTransceiver' is from 'package:flutter_webrtc/src/interface/rtc_rtp_transceiver.dart' ('../../Library/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_webrtc-0.5.7/lib/src/interface/rtc_rtp_transceiver.dart').
Try correcting the name to the name of an existing getter, or defining a getter or field named 'length'.
    if (transceivers != null && transceivers.length > 0) {