[Python] How to fix "SignUpView is missing a QuerySet"

In my django web app i am trying to build a Newspaper app, in my homepage when i click on SIGN UP Button i get an error "ImproperlyConfigured at /accounts/signup/", I didnt figure out where is the problem. forms.py:

from django.contrib.auth.forms import UserCreationForm, UserChangeForm
from .models import CustomUser

class CustomUserCreationForm(UserCreationForm): #Creation of CustomUser

class Meta:
model = CustomUser
fields = UserCreationForm.Meta.fields + ("age",)

class CustomUserChangeForm(UserChangeForm): #Modifying existing users

class Meta:
model = CustomUser
fields = UserChangeForm.Meta.fields


and models.py:

from django.contrib.auth.models import AbstractUser #username, pw1, pw2
from django.db import models

class CustomUser(AbstractUser):
age = models.PositiveIntegerField(null=True, blank=True)



urls.py:

from django.urls import path
from .views import SignUpView

#Accounts/urls.py : Handles only registrations URLs!!
urlpatterns = [
path('signup/', SignUpView.as_view(), name='signup'),
]



and views.py:

from django.urls import reverse_lazy
from django.views.generic import CreateView
from .forms import CustomUserCreationForm

class SignUpView(CreateView):
from_class = CustomUserCreationForm
success_url = reverse_lazy('login')
template_name = 'registration/signup.html'


signup.html:

{% extends 'base.html' %}

{% block title %}Sign Up{% endblock title %}

{% block content %}
<h2>Sign Up</h2>
<form method="post">
{% csrf_token %}
{{ form.as_p }}
<button type="submit">Sign Up</button>
</form>
{% endblock content %}


I tried to change fields in forms.py with:

fields = (
"username",
"email",
"age",)


but nothing to be mention

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