I can't create superuser in Django after customising userprofile.
When I run manage.py syncdb:
TypeError: create_superuser() takes exactly 4 arguments (3 given)
This is my userprofile model:
    from django.db import models
from django.contrib.auth.models import BaseUserManager, AbstractBaseUser, PermissionsMixin
from django.core.validators import RegexValidator
class AuthUserManager(BaseUserManager):
    def create_user(self, username, email, password=None):
        if not username:
            raise ValueError('User must have username')
        if not email:
            raise ValueError('User must have email')
        user = self.model(username=username, email=email.self.normalize_email(email))
        user.is_active = True
        user.set_password(password)
        user.save(using=self._db)
        return user
    def create_superuser(self, username, email, password):
        user = self.create_user(username=username, email=email, password=password)
        user.is_staff = True
        user.is_superuser = True
        user.save(using=self.db)
        return user
class AuthUser(AbstractBaseUser, PermissionsMixin):
    alphanumeric = RegexValidator(r'^[0-9a-zA-Z]*$', message='Only alphanumeric characters are allowed')
    username = models.CharField(unique=True, max_length=30, validators=[alphanumeric])
    email = models.EmailField(verbose_name='email field', unique=True, max_length=255)
    date_joined = models.DateTimeField(auto_now_add=True)
    is_active = models.BooleanField(default=True, null=False)
    is_staff = models.BooleanField(default=False, null=False)
    objects = AuthUserManager()
    USERNAME_FIELD = 'email'
    REQUIRES_FIELDS = ['username']
    def get_full_name(self):
        return '%s %s %s'.format(self.last_name, self.first_name, self.second_name)
    def get_short_name(self):
        return self.username
    def __str__(self):
        self.email
As far as I understand, there is some troubles in REQUIRED_FIELDS, but it contains username, so I don't realize this error
 
    