AttributeError：“ NoneType”对象没有属性“ Command”

Question

当我运行诸如python manage.py runserver之类的任何命令时，我已经在项目上升级了django，它显示了诸如AttributeError: 'NoneType' object has no attribute 'Command'之类的错误，在Django或代码中是否存在任何问题？

Django Pro\Django_Project-master\Dpro> python manage.py migrate
Traceback (most recent call last):
  File "manage.py", line 16, in <module>
    execute_from_command_line(sys.argv)
  File "C:\Users\Ga\Django Pro\Django_Project-master\Dpro\env\lib\site-packages\django\core\management\__init__.py", line 381, in execute_from_command_line
    utility.execute()
  File "C:\Users\Ga\Django Pro\Django_Project-master\Dpro\env\lib\site-packages\django\core\management\__init__.py", line 375, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "C:\Users\Ga\Django Pro\Django_Project-master\Dpro\env\lib\site-packages\django\core\management\__init__.py", line 224, in fetch_command
    klass = load_command_class(app_name, subcommand)
  File "C:\Users\Ga\Django Pro\Django_Project-master\Dpro\env\lib\site-packages\django\core\management\__init__.py", line 37, in load_command_class
    return module.Command()
AttributeError: 'NoneType' object has no attribute 'Command'