Flutter 在 `flutter` 命令上失败

Question

我正在遵循 Getting Started with Flutter 指南，但在运行实际 flutter 命令时卡住了：

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)

Answer 1

看来您的 Dart 版本已过时 < 1.9.2。
尝试 dart --version 获取您安装的 Dart SDK 的版本。
当前为 1.12.x。

更新2018-03-20

在向 Dart 2 的迁移阶段，您可能希望从 dev 频道安装 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

现在还支持：

brew install dart@2

Answer 2

对于遇到类似错误的其他人，我建议您仔细阅读文档。我没有，因此我浪费了很多时间在其他地方寻找解决方案，即使它一直在我眼前：https://flutter.io/setup-macos/#update-your-path

我正在写下命令，以便您可以轻松地将它们复制并粘贴到您的终端中 window:

touch $HOME/.bash_profile
open $HOME/.bash_profile

第 1 行创建一个名为 .bash_profile 的文本文件。第 2 行打开它。

然后必须将下面给出的行粘贴到文本文件中：

export PATH=[PATH_TO_FLUTTER_GIT_DIRECTORY]/flutter/bin:$PATH

粘贴后不要忘记保存文件。 flutter doctor 现在应该可以与每个终端一起工作 window。

Answer 3

打开您的终端并运行这个

export PATH=[PATH_TO_FLUTTER_GIT_DIRECTORY]/flutter/bin:$PATH

然后运行flutter，就可以了

Answer 4

因为你设置的路径是临时的。添加路径

export PATH=[PATH_TO_FLUTTER_GIT_DIRECTORY]/flutter/bin:$PATH

[PATH_TO_FLUTTER_GIT_DIRECTORY] -> 从 git.

下载或克隆的文件夹

然后

echo $PATH

观看此视频以轻松安装 https://www.youtube.com/watch?v=Em8igImhBKc

Flutter 在 `flutter` 命令上失败

Flutter fails on `flutter` command

dart

flutter