每当我运行服务器或在终端中执行任何命令时，都会在终端中显示此错误。服务器正在运行并且网页工作正常，但是当我退出服务器或运行任何命令（如 python manage.py migrate）时，会显示此错误。
`Watching for file changes with StatReloader
Performing system checks...
System check identified no issues (0 silenced).
September 21, 2020 - 12:42:24
Django version 3.0, using settings 'djangoblog.settings'
Starting development server at http://127.0.0.1:8000/
Quit the server with CTRL-BREAK.
Traceback (most recent call last):
File "manage.py", line 22, in <module>
main()
File "manage.py", line 18, in main
execute_from_command_line(sys.argv)
File "C:\Python37\lib\site-packages\django\core\management\__init__.py", line 401, in execute_from_command_line
utility.execute()
File "C:\Python37\lib\site-packages\django\core\management\__init__.py", line 395, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "C:\Python37\lib\site-packages\django\core\management\base.py", line 341, in run_from_argv …