anaconda3无法打开navigator的解决办法

python配置环境真的是够呛。最近在安装anaconda3，pycharm后，更改源，升级各种模板后，突然出现anaconda无法打开navigator的情况。尝试着重新安装、卸载安装，删除注册表所有有关python和anaconda有关的项，全盘搜索含anaconda的目录文件并删除，均无法解决问题，均以网页形式提示：

Traceback (most recent call last):
  File "d:\Anaconda3\lib\site-packages\anaconda_navigator\exceptions.py", line 75, in exception_handler
    return_value = func(*args, **kwargs)
  File "d:\Anaconda3\lib\site-packages\anaconda_navigator\app\start.py", line 150, in start_app
    window = run_app(splash)
  File "d:\Anaconda3\lib\site-packages\anaconda_navigator\app\start.py", line 65, in run_app
    window = MainWindow(splash=splash, tab_project=False)
  File "d:\Anaconda3\lib\site-packages\anaconda_navigator\widgets\main_window.py", line 168, in __init__
    self.api = AnacondaAPI()
  File "d:\Anaconda3\lib\site-packages\anaconda_navigator\api\anaconda_api.py", line 2294, in AnacondaAPI
    ANACONDA_API = _AnacondaAPI()
  File "d:\Anaconda3\lib\site-packages\anaconda_navigator\api\anaconda_api.py", line 91, in __init__
    self._conda_api = CondaAPI()
  File "d:\Anaconda3\lib\site-packages\anaconda_navigator\api\conda_api.py", line 1767, in CondaAPI
    CONDA_API = _CondaAPI()
  File "d:\Anaconda3\lib\site-packages\anaconda_navigator\api\conda_api.py", line 353, in __init__
    self.sys_rc_path = join(self.ROOT_PREFIX, '.condarc')
  File "d:\Anaconda3\lib\ntpath.py", line 76, in join
    path = os.fspath(path)
TypeError: expected str, bytes or os.PathLike object, not NoneType

 继续回溯自己安装过程中曾经动过的文件，用户目录里的pip.ini和.condarc。一个偶然的尝试把.condarc文件删除再打开navigator居然OK了。。。