看一下这个错误错在哪儿，python的一个错误

File "D:\下载\python\md_project-master\meiduo_mall\meiduo_mall\apps\contents\urls.py", line 3, in
from contents import views
File "D:\下载\python\md_project-master\meiduo_mall\meiduo_mall\apps\contents\views.py", line 6, in
from .models import ContentCategory
File "D:\下载\python\md_project-master\meiduo_mall\meiduo_mall\apps\contents\models.py", line 6, in
class ContentCategory(BaseModel):
File "D:\下载\python\md_project-master\meiduo_mall\evne\lib\site-packages\django\db\models\base.py", line 116, in new
"INSTALLED_APPS." % (module, name)
RuntimeError: Model class contents.models.ContentCategory doesn't declare an explicit app_label and isn't in an application in INSTALLED_APPS.

能帮忙解决一下吗?谢谢

django 的应用程序没有注册吧，新建的项目吗？

INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'users.apps.UsersConfig',
    'contents.apps.ContentConfig',
    'verifications.apps.VerificationsConfig',
    'oauth.apps.OauthConfig',
    'areas.apps.AreasConfig',
    'goods.apps.GoodsConfig',
    'haystack',
    'carts.apps.CartsConfig',
    'orders.apps.OrdersConfig',
]