Anaconda安装包或更新错误【Collecting package metadata (current

之前可以用，突然不能用。

下什么包都这样。

更新源 这样报错；

channel_priority:flexible 也会这样；

conda update -n base conda 也这样。

报错头部有： 

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

Traceback (most recent call last):
File "D:anaconda3libsite-packagescondaexceptions.py", line 1079, in __call__         return func(*args, **kwargs)
File "D:anaconda3libsite-packagescondaclimain.py", line 84, in _main         exit_code = do_call(args, p)
File "D:anaconda3libsite-packagescondacliconda_argparse.py", line 83, in do_call         return getattr(module, func_name)(args, parser)
File "D:anaconda3libsite-packagescondaclimain_install.py", line 20, in execute         install(args, parser, 'install')

报错末尾是：

An unexpected error has occurred. Conda has prepared the above report.

If submitted, this report will be used by core maintainers to improve
future releases of conda.
Would you like conda to send this report to the core maintainers?

[y/N]: y
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    $ conda config --set report_errors true

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