Python3.x PackageNotInstalledError：包未安装在前缀中

conda update conda >> successful

conda update anaconda >> gives me error saying package is not installed in prefix.

我在我的系统上只安装了一个Python发行版.我该如何解决这个问题？

(base) C:\Users\asukumari>conda info

 active environment : base
active env location : C:\Users\asukumari\AppData\Local\Continuum\anaconda3
        shell level : 1
   user config file : C:\Users\asukumari\.condarc  populated config files : C:\Users\asukumari\.condarc
      conda version : 4.5.9
conda-build version : 3.4.1
     python version : 3.6.4.final.0
   base environment : C:\Users\asukumari\AppData\Local\Continuum\anaconda3  (writable)
       channel URLs : https://repo.anaconda.com/pkgs/main/win-64
                      https://repo.anaconda.com/pkgs/main/noarch
                      https://repo.anaconda.com/pkgs/free/win-64
                      https://repo.anaconda.com/pkgs/free/noarch
                      https://repo.anaconda.com/pkgs/r/win-64
                      https://repo.anaconda.com/pkgs/r/noarch
                      https://repo.anaconda.com/pkgs/pro/win-64
                      https://repo.anaconda.com/pkgs/pro/noarch
                      https://repo.anaconda.com/pkgs/msys2/win-64
                      https://repo.anaconda.com/pkgs/msys2/noarch
      package cache : C:\Users\asukumari\AppData\Local\Continuum\anaconda3\pkgs
                      C:\Users\asukumari\AppData\Local\conda\conda\pkgs
   envs directories : C:\Users\asukumari\AppData\Local\Continuum\anaconda3\envs
                      C:\Users\asukumari\AppData\Local\conda\conda\envs
                      C:\Users\asukumari\.conda\envs
           platform : win-64
         user-agent : conda/4.5.9 requests/2.18.4 CPython/3.6.4 Windows/10 Windows/10.0.16299
      administrator : False
         netrc file : None
       offline mode : False