我的Django服务器工作得很好，但在安装Angular和React后，我的Django服务器停止工作，并开始发出以下错误：我已经研究了很多，但无法解决错误，请帮助...

Traceback (most recent call last):
  File "C:\Users\LM\dj\policyboss\manage.py", line 22, in <module>
    main()
  File "C:\Users\LM\dj\policyboss\manage.py", line 13, in main
    raise ImportError(
ImportError: Couldn't import Django. Are you sure it's installed and available on your PYTHONPATH environment variable? Did you forget to activate a virtual environment?

字符串
manage.py

#!/usr/bin/env python
"""Django's command-line utility for administrative tasks."""
import os
import sys

def main():
    """Run administrative tasks."""
    os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'policyboss.settings')
    try:
        from django.core.management import execute_from_command_line
    except ImportError as exc:
        raise ImportError(
            "Couldn't import Django. Are you sure it's installed and "
            "available on your PYTHONPATH environment variable? Did you "
            "forget to activate a virtual environment?"
        ) from exc
    execute_from_command_line(sys.argv)

if __name__ == '__main__':
    main()

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