FormatException: Unexpected character (at character 1)

[elianfish]

use huiyiqun/pub_mirror:v1.0.7 -u https://pub.flutter-io.cn/packages

Unhandled exception:
FormatException: Unexpected character (at character 1)

^

#0 _ChunkedJsonParser.fail (dart:convert/runtime/libconvert_patch.dart:1357:5)
#1 _ChunkedJsonParser.parseNumber (dart:convert/runtime/libconvert_patch.dart:1253:9)
#2 _ChunkedJsonParser.parse (dart:convert/runtime/libconvert_patch.dart:921:22)
#3 _parseJson (dart:convert/runtime/libconvert_patch.dart:29:10)
#4 JsonDecoder.convert (dart:convert/json.dart:491:36)
#5 JsonCodec.decode (dart:convert/json.dart:149:41)
#6 PubClient.getPageOfPackages (package:pub_client/pub_client.dart:59:36)

#7 PubMirrorTool.listAllPackages (package:pub_mirror/pub_mirror.dart:69:45)

#8 PubMirrorTool.download (package:pub_mirror/pub_mirror.dart:158:31)
#9 _AsyncAwaitCompleter.start (dart:async/runtime/libasync_patch.dart:49:6)
#10 PubMirrorTool.download (package:pub_mirror/pub_mirror.dart:150:18)
#11 main (file:///root/.pub-cache/hosted/pub.dartlang.org/pub_mirror-1.0.7/bin/pub_mirror.dart:46:8)
#12 _AsyncAwaitCompleter.start (dart:async/runtime/libasync_patch.dart:49:6)
#13 main (file:///root/.pub-cache/hosted/pub.dartlang.org/pub_mirror-1.0.7/bin/pub_mirror.dart:39:5)
#14 _startIsolate. (dart:isolate/runtime/libisolate_patch.dart:287:32)
#15 _RawReceivePortImpl._handleMessage (dart:isolate/runtime/libisolate_patch.dart:171:12)

[elianfish]

使用的源不对，忽略