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Made a custom user, then tried to createsuperuser but got TypeError: hasattr(): attribute name must be string

I've created a new Django project and the first thing I did was create a custom user with the help of Django docs: https://docs.djangoproject.com/en/2.0/topics/auth/customizing/

After I wrote all the code for a custom user, and after I did **makemigrations** and **migrate** for the first time in this Django project, I tried to create a superuser while my virtual env is active by writing:

python manage.py createsuperuser

But it gave me this error:

> TypeError: hasattr(): attribute name must be string

I wrote all the custom user code in an app called **accounts**.

In the **settings** file I added 'accounts' to the INSTALLED_APPS list, and added in the bottom this line:

AUTH_USER_MODEL = 'accounts.CustomUser'

Here's all my source code, starting with models.py:

from django.db import models
from django.contrib.auth.models import AbstractBaseUser, BaseUserManager, PermissionsMixin

class CustomUserManager(BaseUserManager):

def create_user(self, email, password=None):

if not email:
raise ValueError("Users must have an email address")
if not password:
raise ValueError("Users must have a password")

user = self.model(
email = self.normalize_email(email)
)

user.set_password(password)
user.save(using=self._db)

return user

def create_staffuser(self, email, password, first_name, last_name):

if not first_name:
raise ValueError("Staff and superusers must have a first name")
if not last_name:
raise ValueError("Staff and superusers must have a last name")

user = self.create_user(
email,
password=password
)

user.first_name = first_name
user.last_name = last_name
user.is_staff = True
user.save(using=self._db)

return user

def create_superuser(self, email, password, first_name, last_name):

user = self.create_staffuser(
email,
password=password,
first_name=first_name,
last_name=last_name
)

user.is_admin = True
user.is_superuser = True # Not sure if this is needed
user.save(using=self._db)

return user

class CustomUser(AbstractBaseUser, PermissionsMixin):

email = models.EmailField(null=True, max_length=80, unique=True)
USERNAME_FIELD = 'email'
is_active = models.BooleanField(default=True)
is_admin = models.BooleanField(default=False)
is_staff = models.BooleanField(default=False)
first_name = models.CharField(max_length=25, blank=True, null=True)
last_name = models.CharField(max_length=25, blank=True, null=True)
date_joined = models.DateField(auto_now_add=True, null=True)
REQUIRED_FIELDS = [first_name, last_name]

objects = CustomUserManager()

def __str__(self):
return self.email

def get_short_name():
return first_name

def get_full_name():
return first_name + ' ' + last_name

Then I wrote this in forms.py:

from django import forms
from django.contrib.auth.forms import ReadOnlyPasswordHashField
from .models import CustomUser

class UserCreationForm(forms.ModelForm):
"""A form for creating new users. Includes all the required
fields, plus a repeated password."""
password1 = forms.CharField(label='Password', widget=forms.PasswordInput)
password2 = forms.CharField(label='Password confirmation', widget=forms.PasswordInput)

class Meta:
model = CustomUser
fields = ('email', 'first_name', 'last_name')

def clean_password2(self

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