FormatException: FormatException: Bad UTF-8 encoding 0xc3 (at offset 178)

[caiorngcai]

你好，我在启动的时候，遇到这个问题。
FormatException: FormatException: Bad UTF-8 encoding 0xc3 (at offset 178)

#0      _Utf8Decoder.convert (dart:convert/utf.dart:484:15)
#1      _Utf8ConversionSink.addSlice (dart:convert/string_conversion.dart:345:14)
#2      _Utf8ConversionSink.add (dart:convert/string_conversion.dart:341:5)
#3      _ConverterStreamEventSink.add (dart:convert/chunked_conversion.dart:86:18)
#4      _SinkTransformerStreamSubscription._handleData (dart:async/stream_transformers.dart:120:24)
#5      _rootRunUnary (dart:async/zone.dart:1132:38)
#6      _CustomZone.runUnary (dart:async/zone.dart:1029:19)
#7      _CustomZone.runUnaryGuarded (dart:async/zone.dart:931:7)
#8      _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:336:11)
#9      _BufferingStreamSubscription._add (dart:async/stream_impl.dart:263:7)
#10     _SyncStreamController._sendData (dart:async/stream_controller.dart:763:19)
#11     _StreamController._add (dart:async/stream_controller.dart:639:7)
#12     _StreamController.add (dart:async/stream_controller.dart:585:5)
#13     _Socket._onData (dart:io/runtime/binsocket_patch.dart:1721:41)
#14     _rootRunUnary (dart:async/zone.dart:1136:13)
#15     _CustomZone.runUnary (dart:async/zone.dart:1029:19)
#16     _CustomZone.runUnaryGuarded (dart:async/zone.dart:931:7)
#17     _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:336:11)
#18     _BufferingStreamSubscription._add (dart:async/stream_impl.dart:263:7)
#19     _SyncStreamController._sendData (dart:async/stream_controller.dart:763:19)
#20     _StreamController._add (dart:async/stream_controller.dart:639:7)
#21     _StreamController.add (dart:async/stream_controller.dart:585:5)
#22     new _RawSocket.<anonymous closure> (dart:io/runtime/binsocket_patch.dart:1283:33)
#23     _NativeSocket.issueReadEvent.issue (dart:io/runtime/binsocket_patch.dart:826:14)
#24     _microtaskLoop (dart:async/schedule_microtask.dart:41:21)
#25     _startMicrotaskLoop (dart:async/schedule_microtask.dart:50:5)
#26     _runPendingImmediateCallback (dart:isolate/runtime/libisolate_patch.dart:115:13)
#27     _RawReceivePortImpl._handleMessage (dart:isolate/runtime/libisolate_patch.dart:172:5)

网上找了很久没有找到解决方案。运行环境什么的都没有更改，手机是荣耀九。

[boyan01]

可能是 gradle 构建应用出错了，你进入 {project}/android/ 目录下运行 gradlew build 试试？