我正在处理一个flutter项目，当我尝试向pubspec.yaml文件添加新的包或资产并尝试使用“flutter pub get”命令添加依赖项时，该过程并没有结束，退出代码为0。 我用的是VSCode。

Microsoft Windows [Version 6.3.9600]
(c) 2013 Microsoft Corporation. All rights reserved.

A:\Docs\Flutter\messenger>flutter pub get
Running "flutter pub get" in messenger...                           0.7s

A:\Docs\Flutter\messenger>

另外，如果在获取退出代码时忽略，则依赖关系不会反映在代码中，并会出现错误消息

Try creating the file referenced by the URI, or Try using a URI for a file that does exist.darturi_does_not_exist

我也试过get packages按钮，但也不行。 当我尝试添加资产时，这个问题也会发生在资产上

  assets:
    - assets\images\

则显示类似错误代码

The asset assets\images\ does not exist.
Try creating the file or fixing the path to the file.