我正在Intellij Idea中进行flutter项目。当我想在pubspec. yaml中添加一个包时，它导致以下错误：

HTTP error 403: Forbidden

package:pub/src/http.dart 218:5                 _ThrowingClient.send
===== asynchronous gap ===========================
package:http_throttle/http_throttle.dart 33:31  ThrottleClient.send
===== asynchronous gap ===========================
package:pub/src/source/hosted.dart 322:37       BoundHostedSource._download
===== asynchronous gap ===========================
package:pub/src/source/hosted.dart 217:13       BoundHostedSource.downloadToSystemCache
===== asynchronous gap ===========================
package:pub/src/entrypoint.dart 374:48          Entrypoint._get.<fn>

===== asynchronous gap ===========================
dart:async                                      runZoned
package:pub/src/http.dart 272:10                withDependencyType
package:pub/src/entrypoint.dart 370:12          Entrypoint._get
dart:async                                      Future.wait
package:pub/src/entrypoint.dart 231:18          Entrypoint.acquireDependencies
dart:async                                      _completeOnAsyncReturn
package:pub/src/solver/version_solver.dart      VersionSolver.solve
dart:async                                      _completeOnAsyncReturn
package:pub/src/solver/version_solver.dart      VersionSolver._result
This is an unexpected error. Please run

pub --trace '--verbosity=warning' get --no-precompile

and include the logs in an issue on https://github.com/dart-lang/pub/issues/new

我试过使用vpn，没有vpn两个都不起作用。而且，当我添加一些常见的包，如provider或http，它的罚款。
这是我的代码：

dependencies:
 flutter:
     sdk: flutter
 flutter_localizations:
     sdk: flutter

 provider: ^3.2.0
 http: ^0.12.0+2
 font_awesome_flutter: ^8.5.0
 flutter_rating_bar: ^3.0.0

我的flutter sdk版本：抖动窗口v1.9.1+热修复程序.6-稳定_3
你能帮帮我吗？
先谢了