Я использую прокси-модель, Seller(CustomUser) и Customer(CustomUser), я получаю ошибку 'SellerManager' object has no attribute 'normalize_email' error

Ошибка возникает при создании CustomUser путем подклассификации AbstractUser, но я не получаю ошибку при создании Customuser путем подклассификации AbstractBaseUser. Почему?

class CustomUser(AbstractUser): # делаем имя пользователя по умолчанию none вместо использования email в качестве поля имени пользователя имя пользователя = None email = models.EmailField(_('email address'),unique=True) имя = models.CharField(max_length=255)

"""
Multiple user type without extra fields
# 1. Boolean Select Field
# option to make if user is seller or customer
is_customer = models.BooleanField(default=True)
is_seller = models.BooleanField(default=False)

# 2 Choice Field with djnago multiselect
# type = (
    # (1, 'Seller'), 
    # (2, 'Customer')
# )
# to select one of two choice, to select multi instal package django-multiselectfield
# user_type = models.IntegerField(choices=type, default=1)

# 3 Separate class for different rolles and many to many field in user model
# usertype = models.ManyToManyField(UserType)

"""
# Multiple user with extra field
# 1 boolean field with class for different role
# is_customer = models.BooleanField(default=True)
# is_seller = models.BooleanField(default=False)


# Proxy model
class Types(models.TextChoices):
    CUSTOMER = "Customer", "CUSTOMER"
    SELLER = "Seller","SELLER"

default_type = Types.CUSTOMER
type = models.CharField(_('Type'),max_length=255, choices=Types.choices, default=default_type)

# if not code below then taking default value in user model not in proxy in model
# The point is that we do not know what arguments save is expecting so this is 
# basically saying "any arguments passed into our new save(...) method,
# just hand them off to the old overridden save(...) method,
# positional arguments first followed by any keyword arguments"
def save(self, *args, **kwargs):
    if not self.id:
        self.type = self.default_type
    return super().save(*args, **kwargs)

USERNAME_FIELD = 'email'
REQUIRED_FIELDS = ['name']

# specify all objects for the class comes from
objects = CustomUserManager()

def __str__(self):
    return self.name

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