Django - Сохранение формы

Я не могу сохранить свою форму регистрации. Я использую allauth

base.py

ACCOUNT_SIGNUP_FORM_CLASS = 'userauth.forms.SignupForm'

models.py

from modelcluster.contrib.taggit import ClusterTaggableManager

from django.contrib.auth.models import User

class Userr(models.Model):
    tags = ClusterTaggableManager(blank=True)

forms.py

class SignupForm(forms.ModelForm):
    first_name = forms.CharField(max_length=100)
    last_name = forms.CharField(max_length=100)
    
    class Meta:
        model = Userr
        fields = ['tags']

    def signup(self, request, user):
        user.first_name = self.cleaned_data['first_name']
        user.last_name = self.cleaned_data['last_name']
        user.save()

        
        user.userr.tags = self.cleaned_data['tags']
        user.userr.save()

я получаю ошибку

AttributeError at /accounts/signup/ Объект 'User' не имеет атрибута 'userr'

class SignupForm(forms.ModelForm):
    extra_field = forms.CharField(required=True)

    class Meta:
        model = Userr
        fields = ['tags']


    def save(self, commit=True):
        user = super(SignupForm, self).save(commit=False)
        user.extra_field = self.cleaned_data["extra_field"]

        if commit:
            user.save()
        return user