Error: The specified language version is too high. The highest supported language version is 2.13-CodePudding

I downgrade Flutter to 2.2.3 from 2.5.2 for a reason.

Now: Flutter version 2.2.3 and Dart version 2.13.4

in pubspec.yaml:

environment:
  sdk: ">=2.12.0 <3.0.0"

When I run the project it works but I get this message from the console:

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 is what it says: "flutter clean, then run the project." it doesn't fix the problem.

How can I fix this?

CodePudding user response：

Solution 1:

Delete pubspec.lock file.

Then run ,

flutter clean

and

flutter pub get

Solution 2:

flutter pub cache repair