Windows 10 &引用；运行时错误：生成器引发StopIteration“；尝试使用conda安装软件包时

我无法使用conda在Windows 10计算机上安装软件包。尝试使用

conda install（packagename）

安装任何软件包都会导致一长串错误。首先是这样的：

 Traceback (most recent call last):
      File "c:\users\username\appdata\local\programs\python\python38-32\lib\site-packages\conda\install.py", line 201, in yield_lines
        with open(path) as fh:
    FileNotFoundError: [Errno 2] No such file or directory: 'c:\\users\\username\\appdata\\local\\programs\\python\\python38-32\\pkgs\\menuinst-1.4.7-py36_0\\info\\has_prefix'

    During handling of the above exception, another exception occurred:

    Traceback (most recent call last):
      File "c:\users\username\appdata\local\programs\python\python38-32\lib\site-packages\conda\install.py", line 209, in yield_lines
        raise StopIteration
    StopIteration

并继续进行更多的

raisestopIteration

s

这里发生了什么事，我该怎么解决