自定义用户模型，创建超级用户时报错 'Manager' object has no attribute 'get_by_natural_key'
老师您好 请教一个问题
我自定义admin用户模型，在创建超级用户的时候报错： 'Manager' object has no attribute 'get_by_natural_key'
环境：
python v3.7.5
django v2.2.4
# models.py
from django.db import models
from django.contrib.auth.models import AbstractBaseUser
class UserProfile(AbstractBaseUser):
identifier = models.CharField(max_length=40, unique=True)
USERNAME_FIELD = 'identifier'
nick_name = models.CharField(max_length=50, verbose_name='昵称', default='')
birday = models.DateField(verbose_name='生日', null=True, blank=True)
gender = models.CharField(max_length=10, choices=(('male', '男'), ('female', '女')), default='female')
address = models.CharField(max_length=100, default='')
mobile = models.CharField(max_length=11, null=True, blank=True)
image = models.ImageField(upload_to='image/%Y/%m', default='image/default.png', max_length=100)
class Meta:
verbose_name = '用户信息'
verbose_name_plural = verbose_name
