安装包时出现 Dart Pub 错误？答案

【问题标题】：Dart Pub error on package install?安装包时出现 Dart Pub 错误？
【发布时间】：2013-06-07 21:33:02
【问题描述】：

在我更新编辑器之前，Dart 一直在工作，现在我在现有项目和新项目中遇到错误。我尝试完全重新安装 Dart。当我在 web-ui 上为新项目运行 pub install 时收到以下消息：

--- Jun 11, 2013 10:25:11 PM Running pub install ... ---
Pub install failed, [255] Unhandled exception:
FileIOException: Cannot open file 'C:\Users\Phloxicon\Documents\dart\dart-sdk\bin\version' (OS Error: The system cannot find the file specified.

, errno = 2)
#0      _File.throwIfError (file_impl.dart:444:7)
#1      _File.openSync (file_impl.dart:310:17)
#2      _File.readAsBytesSync (file_impl.dart:363:26)
#3      _File.readAsStringSync (file_impl.dart:381:41)
#4      readTextFile (file:///e:/b/build/slave/dart-editor-win-trunk/build/dart/sdk/lib/_internal/pub/lib/src/io.dart:71:68)
#5      _getVersion (file:///e:/b/build/slave/dart-editor-win-trunk/build/dart/sdk/lib/_internal/pub/lib/src/sdk.dart:24:29)
#6      version (file:///e:/b/build/slave/dart-editor-win-trunk/build/dart/sdk/lib/_internal/pub/lib/src/sdk.dart:17:30)
#7      main (file:///e:/b/build/slave/dart-editor-win-trunk/build/dart/sdk/lib/_internal/pub/bin/pub.dart:61:30)

从干净安装的目录中没有“版本”文件是正确的。我添加了该文件并收到以下消息：

--- Jun 11, 2013 10:23:42 PM Running pub install ... ---

Pub install failed, [69] Resolving dependencies...

Failed NSS_Init call.

我在创建新项目时得到以下信息：

--- Jun 11, 2013 10:26:17 PM build.dart --machine --full ---
file:/C:/Users/Phloxicon/Dropbox/dart/MyApp/build.dart
build.dart returned error code 255

Do not know how to load 'dart:uri''package:analyzer_experimental/src/generated/java_core.dart': Error: line 4 pos 1: library handler failed
import "dart:uri";
^
'package:analyzer_experimental/src/generated/ast.dart': Error: line 7 pos 1: library handler failed
import 'java_core.dart';
^
'package:web_ui/src/compiler.dart': Error: line 10 pos 1: library handler failed
import 'package:analyzer_experimental/src/generated/ast.dart' show Directive, UriBasedDirective;
^
'package:web_ui/dwc.dart': Error: line 12 pos 1: library handler failed
import 'src/compiler.dart';
^
'package:web_ui/component_build.dart': Error: line 25 pos 1: library handler failed
import 'dwc.dart' as dwc;
^
'file:///C:/Users/Phloxicon/Dropbox/dart/MyApp/build.dart': Error: line 2 pos 1: library handler failed
import 'package:web_ui/component_build.dart';
^


--- Jun 11, 2013 10:26:18 PM Running pub install ... ---
Pub install failed, [255] Unhandled exception:
FileIOException: Cannot open file 'C:\Users\Phloxicon\Documents\dart\dart-sdk\bin\version' (OS Error: The system cannot find the file specified.

, errno = 2)
#0      _File.throwIfError (file_impl.dart:444:7)
#1      _File.openSync (file_impl.dart:310:17)
#2      _File.readAsBytesSync (file_impl.dart:363:26)
#3      _File.readAsStringSync (file_impl.dart:381:41)
#4      readTextFile (file:///e:/b/build/slave/dart-editor-win-trunk/build/dart/sdk/lib/_internal/pub/lib/src/io.dart:71:68)
#5      _getVersion (file:///e:/b/build/slave/dart-editor-win-trunk/build/dart/sdk/lib/_internal/pub/lib/src/sdk.dart:24:29)
#6      version (file:///e:/b/build/slave/dart-editor-win-trunk/build/dart/sdk/lib/_internal/pub/lib/src/sdk.dart:17:30)
#7      main (file:///e:/b/build/slave/dart-editor-win-trunk/build/dart/sdk/lib/_internal/pub/bin/pub.dart:61:30)


--- Jun 11, 2013 10:26:18 PM build.dart --machine --full ---
file:/C:/Users/Phloxicon/Dropbox/dart/Test02/build.dart
build.dart returned error code 255

Unable to open file: C:/Users/Phloxicon/Dropbox/dart/Test02/packages/web_ui/component_build.dart'file:///C:/Users/Phloxicon/Dropbox/dart/Test02/build.dart': Error: line 2 pos 1: library handler failed
import 'package:web_ui/component_build.dart';
^


--- Jun 11, 2013 10:26:18 PM build.dart --machine --full ---
file:/C:/Users/Phloxicon/Dropbox/dart/quiz_generator/build.dart
build.dart returned error code 255

Do not know how to load 'dart:uri''package:analyzer_experimental/src/generated/java_core.dart': Error: line 4 pos 1: library handler failed
import "dart:uri";
^
'package:analyzer_experimental/src/generated/ast.dart': Error: line 7 pos 1: library handler failed
import 'java_core.dart';
^
'package:web_ui/src/compiler.dart': Error: line 10 pos 1: library handler failed
import 'package:analyzer_experimental/src/generated/ast.dart' show Directive, UriBasedDirective;
^
'package:web_ui/dwc.dart': Error: line 12 pos 1: library handler failed
import 'src/compiler.dart';
^
'package:web_ui/component_build.dart': Error: line 25 pos 1: library handler failed
import 'dwc.dart' as dwc;
^
'file:///C:/Users/Phloxicon/Dropbox/dart/quiz_generator/build.dart': Error: line 2 pos 1: library handler failed
import 'package:web_ui/component_build.dart';
^


--- Jun 11, 2013 10:26:19 PM Running pub install ... ---
Pub install failed, [255] Unhandled exception:
FileIOException: Cannot open file 'C:\Users\Phloxicon\Documents\dart\dart-sdk\bin\version' (OS Error: The system cannot find the file specified.

, errno = 2)
#0      _File.throwIfError (file_impl.dart:444:7)
#1      _File.openSync (file_impl.dart:310:17)
#2      _File.readAsBytesSync (file_impl.dart:363:26)
#3      _File.readAsStringSync (file_impl.dart:381:41)
#4      readTextFile (file:///e:/b/build/slave/dart-editor-win-trunk/build/dart/sdk/lib/_internal/pub/lib/src/io.dart:71:68)
#5      _getVersion (file:///e:/b/build/slave/dart-editor-win-trunk/build/dart/sdk/lib/_internal/pub/lib/src/sdk.dart:24:29)
#6      version (file:///e:/b/build/slave/dart-editor-win-trunk/build/dart/sdk/lib/_internal/pub/lib/src/sdk.dart:17:30)
#7      main (file:///e:/b/build/slave/dart-editor-win-trunk/build/dart/sdk/lib/_internal/pub/bin/pub.dart:61:30)


--- Jun 11, 2013 10:26:19 PM build.dart --machine --full ---
file:/C:/Users/Phloxicon/Dropbox/dart/sdgdsfg/build.dart
build.dart returned error code 255

Unable to open file: C:/Users/Phloxicon/Dropbox/dart/sdgdsfg/packages/web_ui/component_build.dart'file:///C:/Users/Phloxicon/Dropbox/dart/sdgdsfg/build.dart': Error: line 2 pos 1: library handler failed
import 'package:web_ui/component_build.dart';
^


--- Jun 11, 2013 10:26:19 PM Running pub install ... ---
Pub install failed, [255] Unhandled exception:
FileIOException: Cannot open file 'C:\Users\Phloxicon\Documents\dart\dart-sdk\bin\version' (OS Error: The system cannot find the file specified.

, errno = 2)
#0      _File.throwIfError (file_impl.dart:444:7)
#1      _File.openSync (file_impl.dart:310:17)
#2      _File.readAsBytesSync (file_impl.dart:363:26)
#3      _File.readAsStringSync (file_impl.dart:381:41)
#4      readTextFile (file:///e:/b/build/slave/dart-editor-win-trunk/build/dart/sdk/lib/_internal/pub/lib/src/io.dart:71:68)
#5      _getVersion (file:///e:/b/build/slave/dart-editor-win-trunk/build/dart/sdk/lib/_internal/pub/lib/src/sdk.dart:24:29)
#6      version (file:///e:/b/build/slave/dart-editor-win-trunk/build/dart/sdk/lib/_internal/pub/lib/src/sdk.dart:17:30)
#7      main (file:///e:/b/build/slave/dart-editor-win-trunk/build/dart/sdk/lib/_internal/pub/bin/pub.dart:61:30)


--- Jun 11, 2013 10:26:19 PM build.dart --machine --full ---
file:/C:/Users/Phloxicon/Dropbox/dart/srtgdsfg/build.dart
build.dart returned error code 255

Unable to open file: C:/Users/Phloxicon/Dropbox/dart/srtgdsfg/packages/web_ui/component_build.dart'file:///C:/Users/Phloxicon/Dropbox/dart/srtgdsfg/build.dart': Error: line 2 pos 1: library handler failed
import 'package:web_ui/component_build.dart';
^


--- Jun 11, 2013 10:26:19 PM build.dart --machine --full ---
file:/C:/Users/Phloxicon/Dropbox/dart/test1/build.dart
build.dart returned error code 255

Do not know how to load 'dart:uri''package:analyzer_experimental/src/generated/java_core.dart': Error: line 4 pos 1: library handler failed
import "dart:uri";
^
'package:analyzer_experimental/src/generated/ast.dart': Error: line 7 pos 1: library handler failed
import 'java_core.dart';
^
'package:web_ui/src/compiler.dart': Error: line 10 pos 1: library handler failed
import 'package:analyzer_experimental/src/generated/ast.dart' show Directive, UriBasedDirective;
^
'package:web_ui/dwc.dart': Error: line 12 pos 1: library handler failed
import 'src/compiler.dart';
^
'package:web_ui/component_build.dart': Error: line 26 pos 1: library handler failed
import 'dwc.dart' as dwc;
^
'file:///C:/Users/Phloxicon/Dropbox/dart/test1/build.dart': Error: line 2 pos 1: library handler failed
import 'package:web_ui/component_build.dart';
^


--- Jun 11, 2013 10:26:20 PM Running pub install ... ---
Pub install failed, [255] Unhandled exception:
FileIOException: Cannot open file 'C:\Users\Phloxicon\Documents\dart\dart-sdk\bin\version' (OS Error: The system cannot find the file specified.

, errno = 2)
#0      _File.throwIfError (file_impl.dart:444:7)
#1      _File.openSync (file_impl.dart:310:17)
#2      _File.readAsBytesSync (file_impl.dart:363:26)
#3      _File.readAsStringSync (file_impl.dart:381:41)
#4      readTextFile (file:///e:/b/build/slave/dart-editor-win-trunk/build/dart/sdk/lib/_internal/pub/lib/src/io.dart:71:68)
#5      _getVersion (file:///e:/b/build/slave/dart-editor-win-trunk/build/dart/sdk/lib/_internal/pub/lib/src/sdk.dart:24:29)
#6      version (file:///e:/b/build/slave/dart-editor-win-trunk/build/dart/sdk/lib/_internal/pub/lib/src/sdk.dart:17:30)
#7      main (file:///e:/b/build/slave/dart-editor-win-trunk/build/dart/sdk/lib/_internal/pub/bin/pub.dart:61:30)


--- Jun 11, 2013 10:26:20 PM build.dart --machine --full ---
file:/C:/Users/Phloxicon/Dropbox/dart/testest/build.dart
build.dart returned error code 255

Unable to open file: C:/Users/Phloxicon/Dropbox/dart/testest/packages/web_ui/component_build.dart'file:///C:/Users/Phloxicon/Dropbox/dart/testest/build.dart': Error: line 2 pos 1: library handler failed
import 'package:web_ui/component_build.dart';
^


--- Jun 11, 2013 10:26:20 PM Running pub install ... ---
Pub install failed, [255] Unhandled exception:
FileIOException: Cannot open file 'C:\Users\Phloxicon\Documents\dart\dart-sdk\bin\version' (OS Error: The system cannot find the file specified.

, errno = 2)
#0      _File.throwIfError (file_impl.dart:444:7)
#1      _File.openSync (file_impl.dart:310:17)
#2      _File.readAsBytesSync (file_impl.dart:363:26)
#3      _File.readAsStringSync (file_impl.dart:381:41)
#4      readTextFile (file:///e:/b/build/slave/dart-editor-win-trunk/build/dart/sdk/lib/_internal/pub/lib/src/io.dart:71:68)
#5      _getVersion (file:///e:/b/build/slave/dart-editor-win-trunk/build/dart/sdk/lib/_internal/pub/lib/src/sdk.dart:24:29)
#6      version (file:///e:/b/build/slave/dart-editor-win-trunk/build/dart/sdk/lib/_internal/pub/lib/src/sdk.dart:17:30)
#7      main (file:///e:/b/build/slave/dart-editor-win-trunk/build/dart/sdk/lib/_internal/pub/bin/pub.dart:61:30)

有什么想法吗？

【问题讨论】：

标签： dart dart-pub

【解决方案1】：

Cannot open file 'C:\Users\Phloxicon\Documents\dart\dart-sdk\bin\version'

这看起来您的 Dart 安装已损坏。安装 Dart SDK 时，该文件肯定存在，没有它 pub 就无法工作。

您是自己构建 SDK，还是只是下载预构建的 SDK？

【讨论】：

下载一个预建的。我尝试从我的计算机中删除所有 Dart 并重新安装，但没有成功。公平地说，自从我因为这个问题而停止使用 Dart 已经有一段时间了，所以新的安装可能会很好用。有时间我会试试看的。
好的，很抱歉给您带来麻烦。如果您在使用最新版本时仍有问题，请告诉我。

【解决方案2】：

尝试pub update 而不是pub install，以便在可能的情况下更新缓存的包。

然后使用同一工具菜单中的Reanalyze Sources。请务必在运行 Reanalyze Sources 之前清除所有日志，以便确保它进行了干净的构建。

如果这不能让您彻底清理干净，请删除您在项目树中看到的所有 packages 目录，以及可能存在的所有 out 目录，以及 pubspec.lock 文件。然后运行pub install。

这通常会让我回到干净的构建。

【讨论】：

感谢您的回复。不幸的是，没有一个工作。不过，我会继续努力。谢谢。
@PhloxMidas 我刚刚注意到您收到的第一条错误消息与 dart:uri 包有关，由于 Uri 类已移至 dart:core 中，因此该包不再存在！删除所有 dart:uri 的导入，看看你如何使用最新的 SDK。
您的意思是从标准库函数中删除它们吗？我不相信我在代码中调用 dart:uri。是我使用 package:web_ui/web_ui.dart 并调用 dart:uri 吗？对我来说没有意义我对一个新项目使用了全新安装，我得到了这个错误，但每个人都很好地使用了编辑器。也许还有另一个我没有找到的缓存？
@PhloxMidas 可能是您以前安装的 pub 缓存已损坏，然后没有被清理。我使用 Mac 进行 Dart 开发，并且我的 pub 缓存位于 ~/.pub-cache，但这个问题 (code.google.com/p/dart/issues/detail?id=10715) 显示了您可以在 Windows 上找到 pub 缓存的位置。从项目中删除包文件夹和 pubspec.lock 后（不要重新分析），关闭 Dart 编辑器并尝试删除 pub 缓存，然后再次启动 Dart 编辑器并发布安装。只要您目前没有任何正在使用 Dart 编辑器的项目，就可以这样做。