Я не могу создать суперпользователя postgresql и Django

Я делаю проект с Django, в котором пытаюсь изменить базу данных с SQLITE на Postqresql. Когда я пытаюсь создать суперпользователя, я получаю эту ошибку.

Traceback (most recent call last):
  File "manage.py", line 22, in <module>
    main()
  File "manage.py", line 18, in main
    execute_from_command_line(sys.argv)
  File "C:\Users\l\anaconda3\envs\myenv\lib\site-packages\django\core\management\__init__.py", line 419, in execute_from_command_line
    utility.execute()
  File "C:\Users\l\anaconda3\envs\myenv\lib\site-packages\django\core\management\__init__.py", line 413, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "C:\Users\l\anaconda3\envs\myenv\lib\site-packages\django\core\management\base.py", line 354, in run_from_argv
    self.execute(*args, **cmd_options)
  File "C:\Users\l\anaconda3\envs\myenv\lib\site-packages\django\contrib\auth\management\commands\createsuperuser.py", line 79, in execute
    return super().execute(*args, **options)
  File "C:\Users\l\anaconda3\envs\myenv\lib\site-packages\django\core\management\base.py", line 398, in execute
    output = self.handle(*args, **options)
  File "C:\Users\l\anaconda3\envs\myenv\lib\site-packages\django\contrib\auth\management\commands\createsuperuser.py", line 189, in handle
    self.UserModel._default_manager.db_manager(database).create_superuser(**user_data)
  File "C:\Users\l\anaconda3\envs\myenv\lib\site-packages\django\contrib\auth\models.py", line 163, in create_superuser
    return self._create_user(username, email, password, **extra_fields)
  File "C:\Users\l\anaconda3\envs\myenv\lib\site-packages\django\contrib\auth\models.py", line 146, in _create_user
    user.save(using=self._db)
  File "C:\Users\l\anaconda3\envs\myenv\lib\site-packages\django\contrib\auth\base_user.py", line 67, in save
    super().save(*args, **kwargs)
  File "C:\Users\l\anaconda3\envs\myenv\lib\site-packages\django\db\models\base.py", line 726, in save
    self.save_base(using=using, force_insert=force_insert,
  File "C:\Users\l\anaconda3\envs\myenv\lib\site-packages\django\db\models\base.py", line 774, in save_base
    post_save.send(
  File "C:\Users\l\anaconda3\envs\myenv\lib\site-packages\django\dispatch\dispatcher.py", line 180, in send
    return [
  File "C:\Users\l\anaconda3\envs\myenv\lib\site-packages\django\dispatch\dispatcher.py", line 181, in <listcomp>
    (receiver, receiver(signal=self, sender=sender, **named))
  File "C:\Users\l\Desktop\django-course\Django(02-09-21)\crm1\accounts\signals.py", line 7, in customer_profile
    group = Group.objects.get(name='customer')
  File "C:\Users\l\anaconda3\envs\myenv\lib\site-packages\django\db\models\manager.py", line 85, in manager_method
    return getattr(self.get_queryset(), name)(*args, **kwargs)
  File "C:\Users\l\anaconda3\envs\myenv\lib\site-packages\django\db\models\query.py", line 435, in get
    raise self.model.DoesNotExist(
django.contrib.auth.models.DoesNotExist: Group matching query does not exist.

settings.py

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.postgresql',
        'NAME': 'DEMO_TEST',
        'USER' : 'postgres',
        'HOST': 'localhost',
        'PASSWORD':'12345678abcdef',
        'PORT': '5432',
    }
}

models.py

from django.db import models
from django.db.models.deletion import SET_NULL
from django.contrib.auth.models import User

class Customer(models.Model):
    user = models.OneToOneField(User, null=True, blank=True, on_delete=models.CASCADE)
    name = models.CharField(max_length=200, null=True)
    phone = models.CharField(max_length=200, null=True)
    email = models.CharField(max_length=200, null=True)
    profile_pic = models.ImageField(default='profile1.png',null=True, blank=True)
    date_created = models.DateTimeField(auto_now_add=True, null=True)
    
    def __str__(self):
        return self.name

class Tag(models.Model):
    name = models.CharField(max_length=200, null=True)
    
    def __str__(self):
        return self.name 

class Product(models.Model):
    CATEGORY = (
            ('Indoor', 'Indoor'),
            ('Out Door', 'Out Door'),
            ) 
    
    name = models.CharField(max_length=200, null=True)
    prince = models.FloatField(null=True)
    category = models.CharField(max_length=200, null=True, choices=CATEGORY)
    description = models.CharField(max_length=200, null=True, blank=True)
    date_created = models.DateTimeField(auto_now_add=True, null=True)
    tags = models.ManyToManyField(Tag)

    def __str__(self):
        return self.name

class Order(models.Model):
    STATUS = (
            ('Pending', 'Pending'),
            ('Out for delivery', 'Out for delivery'),
            ('Delivered', 'Delivered'),
            )
    
    customer = models.ForeignKey(Customer, null=True, on_delete=SET_NULL)
    product = models.ForeignKey(Product, null=True, on_delete=SET_NULL)
    status = models.CharField(max_length=200, null=True, choices=STATUS)
    date_created = models.DateTimeField(auto_now_add=True, null=True)
    note = models.CharField(max_length=1000, null=True)

    def __str__(self):
        return self.product.name
    

Проект работает нормально, когда я включаю сервер Django; проблема возникает, когда я пытаюсь создать суперпользователя из терминала. Я не уверен, происходит ли проблема из-за соединения базы данных Postgresql с проектом, или это какая-то проблема миграции моделей, созданных и загруженных в базу данных Django по умолчанию (SQLITE) ... Было бы здорово получить помощь, спасибо большое

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