Conda commands not working correctly

I met some problems after installing Anaconda3.
 
My operation system is Win 10;
Anaconda version is Anaconda3-5.2.0-Windows-x86_64;
Installation location is : C:Anaconda
 
When I type “conda”, “python”, ”pip” or “–version”, they work correctly.
But if I type “conda list” or “conda update conda ”, it has some errors as followed:
 

Traceback (most recent call last):
      File "C:Anacondalibsite-packagescondaclimain.py", line 97, in main
        from ..activate import main as activator_main
      File "C:Anacondalibsite-packagescondaactivate.py", line 12, in <module>
        context.__init__()  # oOn import, context does not include SEARCH_PATH. This line fixes that.
.
.
.
 File "C:Anacondalibsite-packagesruamel_yamlreader.py", line 241, in update
        self.check_printable(data)
      File "C:Anacondalibsite-packagesruamel_yamlreader.py", line 208, in check_printable
        'unicode', "special characters are not allowed")
    ruamel_yaml.reader.ReaderError: unacceptable character #x0000: special characters are not allowed
      in "C:Usersmartin.condarc", position 0

 
I think the reason might be something about unicode, I tried to find the answer on google and stack overflow, unfortunately, I still cannot solve it.