dart – Flutter在`flutter`命令失败

发布时间：2020-12-14 14:48:23 所属栏目：百科来源：网络整理

导读：我正在遵循 Getting Started with Flutter指南并在运行实际的flutter命令时卡住： flutter init -o my_appResolving dependencies...Error on line 17,column 16 of pubspec.yaml: Invalid version constraint: Could not parse version "^1.4.0". Unknown t

我正在遵循 Getting Started with Flutter指南并在运行实际的flutter命令时卡住：

flutter init -o my_app
Resolving dependencies...
Error on line 17,column 16 of pubspec.yaml: Invalid version constraint: Could not parse version "^1.4.0". Unknown text at "^1.4.0".
  stack_trace: ^1.4.0
               ^^^^^^
Unhandled exception:
Uncaught Error: FileSystemException: Cannot open file,path = '/Users/craig/Code/flutter/packages/flutter_tools/packages/sky_tools/executable.dart' (OS Error: No such file or directory,errno = 2)
Stack Trace:
#0      _File.open.<anonymous closure> (dart:io/file_impl.dart:349)
#1      _RootZone.runUnary (dart:async/zone.dart:1151)
#2      _Future._propagateToListeners.handleValueCallback (dart:async/future_impl.dart:496)
#3      _Future._propagateToListeners (dart:async/future_impl.dart:579)
#4      _Future._completeWithValue (dart:async/future_impl.dart:339)
#5      _Future._asyncComplete.<anonymous closure> (dart:async/future_impl.dart:401)
#6      _asyncRunCallbackLoop (dart:async/schedule_microtask.dart:41)
#7      _asyncRunCallback (dart:async/schedule_microtask.dart:48)
#8      _runPendingImmediateCallback (dart:isolate-patch/isolate_patch.dart:84)
#9      _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:131)

#0      _rootHandleUncaughtError.<anonymous closure> (dart:async/zone.dart:883)
#1      _asyncRunCallbackLoop (dart:async/schedule_microtask.dart:41)
#2      _asyncRunCallback (dart:async/schedule_microtask.dart:48)
#3      _runPendingImmediateCallback (dart:isolate-patch/isolate_patch.dart:84)
#4      _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:131)
Unhandled exception:
Uncaught Error: FileSystemException: Cannot open file,path = '/Users/craig/Code/flutter/bin/cache/flutter_tools.snapshot' (OS Error: No such file or directory,errno = 2)
Stack Trace:
#0      _File.open.<anonymous closure> (dart:io/file_impl.dart:349)
#1      _RootZone.runUnary (dart:async/zone.dart:1151)
#2      _Future._propagateToListeners.handleValueCallback (dart:async/future_impl.dart:496)
#3      _Future._propagateToListeners (dart:async/future_impl.dart:579)
#4      _Future._completeWithValue (dart:async/future_impl.dart:339)
#5      _Future._asyncComplete.<anonymous closure> (dart:async/future_impl.dart:401)
#6      _asyncRunCallbackLoop (dart:async/schedule_microtask.dart:41)
#7      _asyncRunCallback (dart:async/schedule_microtask.dart:48)
#8      _runPendingImmediateCallback (dart:isolate-patch/isolate_patch.dart:84)
#9      _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:131)

#0      _rootHandleUncaughtError.<anonymous closure> (dart:async/zone.dart:883)
#1      _asyncRunCallbackLoop (dart:async/schedule_microtask.dart:41)
#2      _asyncRunCallback (dart:async/schedule_microtask.dart:48)
#3      _runPendingImmediateCallback (dart:isolate-patch/isolate_patch.dart:84)
#4      _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:131)

解决方法

看起来您的Dart版本已过时< 1.9.2.
尝试使用dart –version获取已安装的Dart SDK的版本.
当前是1.12.x.

更新2018-03-20

在迁移阶段到Dart 2期间,您可能希望从开发通道安装Dart以获得2.0.0-alpha.x版本.
最新的稳定版本是1.24.x

例如

brew install dart --devel

更新2018-06-21

现在也支持：

brew install dart@2

（编辑：李大同）

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