Django All-Auth django.contrib.auth.backends.ModelBackend无效语法

pip install django-allauth

INSTALLED_APPS = [
    # ...
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'allauth',
    'allauth.account',
    # ...
]

AUTHENTICATION_BACKENDS = [
    # ...
    'django.contrib.auth.backends.ModelBackend',
    'allauth.account.auth_backends.AuthenticationBackend',
    # ...
]

SITE_ID = 1

from django.urls import path, include

urlpatterns = [
    # ...
    path('accounts/', include('allauth.urls')),
    # ...
]

python manage.py migrate