Anaconda创建环境报错：An unexpected error has occurred. Conda has prepared the above report

(base) PS C:\Users\zheng> conda create -n env1 python=3.9
Collecting package metadata (current_repodata.json): failed

# >>>>>>>>>>>>>>>>>>>>>> ERROR REPORT <<<<<<<<<<<<<<<<<<<<<<

    Traceback (most recent call last):
      File "C:\Users\zheng\anaconda3\lib\site-packages\conda\core\subdir_data.py", line 719, in fetch_repodata_remote_request
        resp.raise_for_status()
      File "C:\Users\zheng\anaconda3\lib\site-packages\requests\models.py", line 960, in raise_for_status
        raise HTTPError(http_error_msg, response=self)
    requests.exceptions.HTTPError: 404 Client Error: Not Found for url: https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/free/noarch/current_repodata.json

    During handling of the above exception, another exception occurred:

    Traceback (most recent call last):
      File "C:\Users\zheng\anaconda3\lib\site-packages\requests\models.py", line 910, in json
        return complexjson.loads(self.text, **kwargs)
      File "C:\Users\zheng\anaconda3\lib\site-packages\simplejson\__init__.py", line 525, in loads
        return _default_decoder.decode(s)
      File "C:\Users\zheng\anaconda3\lib\site-packages\simplejson\decoder.py", line 372, in decode
        obj, end = self.raw_decode(s)
      File "C:\Users\zheng\anaconda3\lib\site-packages\simplejson\decoder.py", line 402, in raw_decode
        return self.scan_once(s, idx=_w(s, idx).end())
    simplejson.errors.JSONDecodeError: Expecting value: line 1 column 1 (char 0)

    During handling of the above exception, another exception occurred:

    Traceback (most recent call last):
      File "C:\Users\zheng\anaconda3\lib\site-packages\conda\exceptions.py", line 1125, in __call__
        return func(*args, **kwargs)
      File "C:\Users\zheng\anaconda3\lib\site-packages\conda\cli\main.py", line 86, in main_subshell
        exit_code = do_call(args, p)
      File "C:\Users\zheng\anaconda3\lib\site-packages\conda\cli\conda_argparse.py", line 93, in do_call
        return getattr(module, func_name)(args, parser)
      File "C:\Users\zheng\anaconda3\lib\site-packages\conda\notices\core.py", line 72, in wrapper
        return_value = func(*args, **kwargs)
      File "C:\Users\zheng\anaconda3\lib\site-packages\conda\cli\main_create.py", line 43, in execute
        install(args, parser, 'create')
      File "C:\Users\zheng\anac