初次格式化数据库表，出现：
ValueError: Related model 'users.UserProfile' cannot be resolved
解决办法：
1.python manage.py makemigrations --empty users
2.python manage.py makemigrations
3.python manage.py migrate users
4.python manage.py migrate
初次格式化数据库表，出现：
ValueError: Related model 'users.UserProfile' cannot be resolved
解决办法：
1.python manage.py makemigrations --empty users
2.python manage.py makemigrations
3.python manage.py migrate users
4.python manage.py migrate