我正在尝试运行python manage.py migration first_app命令，但出现以下错误：
File "C:\Users\a\Anaconda3\lib\site-packages\django\__init__.py", line 24, in setup
apps.populate(settings.INSTALLED_APPS)
File "C:\Users\a\Anaconda3\lib\site-packages\django\apps\registry.py", line 112, in populate app_config.import_models()
File "C:\Users\a\Anaconda3\lib\site-packages\django\apps\config.py", line 198,
in import_models self.models_module = import_module(models_module_name)
File "C:\Users\a\Anaconda3\lib\importlib\__init__.py", line 126, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>", line 994, in _gcd_import
File "<frozen importlib._bootstrap>", line 971, in _find_and_load
File "<frozen importlib._bootstrap>", line 955,_find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
File "<frozen importlib._bootstrap_external>", line 678, in exec_module
File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
File "C:\Users\a\Desktop\My_django\atom-master\first_project\first_app\models.py", line 18, in <module>
class AccessRecord(models.Model):File "C:\Users\a\Desktop\My_django\atom-master\first_project\first_app\models.py", line 19, in AccessRecord
name = models.ForeignKey(Webpage)
TypeError: __init__() missing 1 required positional argument: 'on_delete'