错误:指定的语言版本太高了。最受支持的语言版本是2.13
错误:指定的语言版本太高了。最受支持的语言版本是2.13
提问于 2021-10-12 17:47:39
出于某种原因，我将信用评级从2.5.2降至2.2.3。
现在：Flutter version 2.2.3和Dart version 2.13.4
在pubspec.yaml中：
environment:
sdk: ">=2.12.0 <3.0.0"当我运行该项目时，它可以工作，但我从控制台获得以下消息：
Failed to precompile devtools:devtools:
/C:/Users/user/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/shelf_proxy-1.0.1/lib/shelf_proxy.dart:1:1: Error: The specified language version is too high. The highest supported language version is 2.13.
// Copyright (c) 2014, the Dart project authors. Please see the AUTHORS file
^
/C:/Users/user/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/http-0.13.4/lib/http.dart:1:1: Error: The specified language version is too high. The highest supported language version is 2.13.
// Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
^
/C:/Users/user/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/http-0.13.4/lib/src/client.dart:1:1: Error: The specified language version is too high. The highest supported language version is 2.13.
// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
^
/C:/Users/user/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/http-0.13.4/lib/src/exception.dart:1:1: Error: The specified language version is too high. The highest supported language version is 2.13.
// Copyright (c) 2014, the Dart project authors. Please see the AUTHORS file
^
/C:/Users/user/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/http-0.13.4/lib/src/request.dart:1:1: Error: The specified language version is too high. The highest supported language version is 2.13.
// Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
^
/C:/Users/user/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/http-0.13.4/lib/src/response.dart:1:1: Error: The specified language version is too high. The highest supported language version is 2.13.
// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
^
/C:/Users/user/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/http-0.13.4/lib/src/streamed_request.dart:1:1: Error: The specified language version is too high. The highest supported language version is 2.13.
// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
^
/C:/Users/user/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/http-0.13.4/lib/src/base_client.dart:1:1: Error: The specified language version is too high. The highest supported language version is 2.13.
// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
^
/C:/Users/user/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/http-0.13.4/lib/src/base_request.dart:1:1: Error: The specified language version is too high. The highest supported language version is 2.13.
// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
^
/C:/Users/user/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/http-0.13.4/lib/src/base_response.dart:1:1: Error: The specified language version is too high. The highest supported language version is 2.13.
// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
^Here是这样说的："flutter clean，然后运行这个项目。“它不能解决问题。
我怎么才能解决这个问题？
回答 2
Stack Overflow用户
回答已采纳
发布于 2021-10-12 18:26:03
解决方案1
删除pubspec.lock文件。
那就跑，
flutter clean和
flutter pub get
解决方案2
flutter pub cache repair免责声明:当运行上面的命令，有一个非常快的互联网连接，或准备好浪费几个小时的生产时间。(这将重新下载安装在pc上的每个软件包，我指的是每个软件包的所有版本)
Stack Overflow用户
发布于 2022-05-17 13:39:42
我试过以上所有的方法，但没有任何帮助。
然后，我决定确保自己是在最新的Android上(无论如何，我仍然保持着非常最新的状态)，然后更新我使用的几个插件。我安装了Android补丁，为了安全起见，我检查了更新，它显示了一个现在可用的更新，所以我安装了它。
然后我确保我所有的插件都是最新的。他们已经是，因为我最近也更新了他们。
在做完这件事之后，我现在可以运行devtools了..。终于来了。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/69544908
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