Unhandled exception:

FormatException: Scheme not starting with alphabetic character (at character 1)

?https://pub.flutter-io.cn

^

#0? ? ? _Uri._fail (dart:core/uri.dart:1623:5)

#1? ? ? _Uri._makeScheme (dart:core/uri.dart:2184:7)

#2? ? ? new _Uri.notSimple (dart:core/uri.dart:1465:18)

#3? ? ? Uri.parse (dart:core/uri.dart:1022:17)

#4? ? ? HostedSource._pubHostedUrlConfig (package:pub/src/source/hosted.dart:57:19)

#5? ? ? HostedSource.defaultUrl (package:pub/src/source/hosted.dart:50:28)

#6? ? ? new UploaderCommand (package:pub/src/command/uploader.dart:27:42)

#7? ? ? new PubCommandRunner (package:pub/src/command_runner.dart:107:16)

#8? ? ? main (file:///C:/b/s/w/ir/k/src/third_party/dart/third_party/pkg/pub/bin/pub.dart:8:3)

#9? ? ? _startIsolate.<anonymous closure> (dart:isolate-patch/isolate_patch.dart:303:32)

#10? ? ?_RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:172:12)

Running "flutter pub get" in flutter_lession...

pub get failed (255)