fanfan

错误如下： Flutter crash report. Please report a bug at https://github.com/flutter/flutter/issues. ## command flutter run ## exception StateError: Bad state: No element ``` #0 ListMixin.firstWhere (dart:collection/list.dart:167:5) #1 DartDevelopmentService.startDartDevelopmentService (package:flutter_tools/src/base/dds.dart:63:32) #2 FlutterDevice.connect....