getting __init__() got an unexpected keyword argument 'instance'

Hi all,

I am trying to create the django application with new django version 2.2.3, I am getting the

TypeError at /signup/

__init__() got an unexpected keyword argument 'instance'

models.py 
from django.db import models
from django.contrib.auth.models import AbstractBaseUser, UserManager, PermissionsMixin


# Create your models here.

class MyUser(AbstractBaseUser, PermissionsMixin):
    USER_TYPES = (
        ('0', 'SuperAdmin'),
        ('1', 'User'),
        ('2', 'Manager')
    )
    GENDER_TYPES = (
        ('0', 'Male'),
        ('1', 'FeMale'),
        ('2', 'Others')
    )

    first_name = models.CharField(('first_name'), max_length=50)
    last_name = models.CharField(('last_name'), max_length=50)
    username = models.CharField(('username'), max_length=150, unique=True)
    country_code = models.CharField(('country_code'), max_length=6)
    mobile_number = models.CharField(('phone number'), max_length=10, unique=True)
    email = models.EmailField(('email address'), max_length=200, unique=True)
    USERNAME_FIELD = 'username'
    REQUIRED_FIELDS = ['email']
    gender = models.CharField(max_length=1, choices=GENDER_TYPES, default=0)
    image = models.ImageField(upload_to='images', null=True)
    address = models.CharField(('user address'), max_length=200, null=True)
    role = models.CharField(max_length=1, choices=USER_TYPES, default='1')
    created_at = models.DateTimeField(('created_at'), auto_now_add=True)
    updated_at = models.DateTimeField(('updated_at'), auto_now=True)
    is_active = models.BooleanField(default=True)
    is_staff = models.BooleanField(default=True)
    is_superuser = models.BooleanField(default=False)
    is_user = models.BooleanField(default=False)
    is_manager = models.BooleanField(default=False)

    objects = UserManager()

    class Meta:
        db_table = 'users'
        ordering = ['first_name']

    def save(self, *args, **kwargs):
        if self.is_superuser:
            self.role = 0
        elif self.is_user:
            self.role = 1
            self.is_superuser = 0
        elif self.is_manager:
            self.role = 2
            self.is_superuser = 0
        super(MyUser, self).save(*args, **kwargs)

forms.py

from django.contrib.auth.forms import UserCreationForm
from material import Layout, Row
from django import forms
from .models import *

class RegistrationForm(forms.Form):
    class Meta:
        model = MyUser
        first_name = forms.CharField(label='First Name', required=True)
        last_name = forms.CharField(label='Last Name')
        username = forms.CharField(label= 'User Name')
        country_code = forms.CharField(label='Country Code')
        mobile_number = forms.CharField(label='Mobile Number', required=True,)
        email = forms.EmailField(label='Email Address', required=True)
        gender = forms.ChoiceField(choices=((None, ''), ('M', 'Male'), ('F', 'FeMale'), ('O', 'Others')))
        password = forms.CharField(widget=forms.PasswordInput)
        password_confirm = forms.CharField(widget=forms.PasswordInput, label="Confirm Password")

        layout = Layout(Row('first_name', 'last_name', 'user_name'),
                Row('country_code', 'mobile_number', 'email'),
                Row('gender', 'password', 'password_confirm')
            )

views.py


from django.shortcuts import render
from .models import MyUser
from .forms import RegistrationForm
from django.views.generic import CreateView
# Create your views here.

class RegistrationView(CreateView):
    model = MyUser
    form_class = RegistrationForm
    template_name = "signup.html"

urls.py

from django.conf.urls import url
from django.urls import path
from . import views


"""
URLS for USERS
"""
urlpatterns=[
    url(r'^signup/$', views.RegistrationView.as_view(), name='signup')
]

singup.html

<form method="POST">
    {% csrf_token %}
    {% form %}
        {% part form.username prefix %}<i class="material-icons prefix">account_box</i>{% endpart %}
        {% part form.email prefix %}<i class="material-icons prefix">email</i>{% endpart %}
        {% part form.password prefix %}<i class="material-icons prefix">lock_open</i>{% endpart %}
    {% endform %}
    <button type="submit" class="btn">Submit</button>
</form>

please help me how to resolve that error and I have included templates in settings also

PFA of error what I am getting.

Thanks and Regards,

Premkumar Ch.

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