dart – Flutter在`flutter`命令失败

概述我正在遵循 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 versi 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 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

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