今天用read the docs的时候出现了下面的错误：

Extension error:
'md' \u7684 source_parser \u5df2\u6ce8\u518c
Command exited with exit code: 2
The server will continue serving the build folder, but the contents being served are no longer in sync with the documentation sources. Please fix the cause of the error above or press Ctrl+C to stop the server.

解决方法

pip install Sphinx --upgrade

升级一下Sphinx就行了，我原来的Sphinx是2.1.2版本，我现在升级到3.5.4就可以了哈。