django user model error: Hello friends, I keep getting this error; "accounts.User.groups: (fields.E304) Reverse accessor for 'User.groups' clashes with reverse accessor for 'User.groups'. Please help

[Kenaz Odhiambo]

from django.contrib.auth.models import AbstractUser
from django.core.validators import (
    MinValueValidator,
    MaxValueValidator,
    RegexValidator
)
from django.db import models
from django.utils.translation import ugettext_lazy as _

from .managers import UserManager


class User(AbstractUser):
    username = models.CharField(
        _('username'), max_length=30, unique=True, null=True, blank=True,
        help_text=_(
            'Required. 30 characters or fewer. Letters, digits and '
            '@/./+/-/_ only.'
        ),
        validators=[
            RegexValidator(
                r'^[\w.@+-]+$',
                _('Enter a valid username. '
                    'This value may contain only letters, numbers '
                    'and @/./+/-/_ characters.'), 'invalid'),
        ],
        error_messages={
            'unique': _("A user with that username already exists."),
        })

    email = models.EmailField(unique=True, null=False, blank=False)
    contact_no = models.IntegerField(unique=True, blank=True, null=True)

    objects = UserManager()

    USERNAME_FIELD = 'email'
    REQUIRED_FIELDS = []

    def __str__(self):
        return self.email

    @property
    def account_no(self):
        if hasattr(self, 'account'):
            return self.account.account_no
        return None

    @property
    def full_name(self):
        return '{} {}'.format(self.first_name, self.last_name)

    @property
    def balance(self):
        if hasattr(self, 'account'):
            return self.account.balance
        return None

    @property
    def full_address(self):
        if hasattr(self, 'address'):
            return '{}, {}-{}, {}'.format(
                self.address.street_address,
                self.address.city,
                self.address.postal_code,
                self.address.country,
            )
        return None


class AccountDetails(models.Model):
    GENDER_CHOICE = (
        ("M", "Male"),
        ("F", "Female"),
    )
    user = models.OneToOneField(
        User,
        related_name='account',
        on_delete=models.CASCADE,
    )
    account_no = models.PositiveIntegerField(
        unique=True,
        validators=[
            MinValueValidator(10000000),
            MaxValueValidator(99999999)
        ]
    )
    gender = models.CharField(max_length=1, choices=GENDER_CHOICE)
    birth_date = models.DateField(null=True, blank=True)
    balance = models.DecimalField(
        default=0,
        max_digits=12,
        decimal_places=2
    )
    picture = models.ImageField(
        null=True,
        blank=True,
        upload_to='account_pictures/',
    )

    def __str__(self):
        return str(self.account_no)


class UserAddress(models.Model):
    user = models.OneToOneField(
        User,
        related_name='address',
        on_delete=models.CASCADE,
    )
    street_address = models.CharField(max_length=512)
    city = models.CharField(max_length=256)
    postal_code = models.PositiveSmallIntegerField()
    country = models.CharField(max_length=256)

    def __str__(self):
        return self.user.email