Error in django 'PatientManager' object has no attribute 'normalize_email'

احاول التعامل مع أنواع مختلفة من المستخدمين في مشروع جانقو ولكنني اواجه هذه المشكلة عندما احاول تسجيل مستخدم جديد من نوع مريض من خلال هذه الدالة

def signup(request):
    form = PatientSignUpForm()
    print('test')
    if request.method == "POST":
        form = PatientSignUpForm(request.POST)
        if form.is_valid():
            print('tesitng adding user')
            patient = form.save()
            patientMore = PatientMore.objects.create(
                gender = form.cleaned_data.get('gender'),
                job = form.cleaned_data.get('job'),
                user = patient
            )
            print('done')
            return redirect('home')
    return render(request, 'signup.html', {'form':form})

استخدمت البروكسي للتفريق بين انواع المستخدمين وقمت بعمل manager لكل نوع وهذه هي ال models

class User(AbstractUser):

    class Types(models.TextChoices):
        Patient = 'Patient', 'Patient'
        Doctor = 'Doctor', 'Doctor'
        StaffMember = 'Staff', 'Staff'

    type = models.CharField(_("Type"), max_length=50, choices=Types.choices, default=Types.Patient)

    name = models.CharField(_('name of user'), blank=True, max_length=255)

    def get_absolute_url(self):
        return reverse('users:detail', kwargs={'username': self.username})

class PatientMore(models.Model):
    GENDER_MALE = 0
    GENDER_FEMALE = 1
    GENDER_CHOICES = [(GENDER_MALE, 'Male'), (GENDER_FEMALE, 'Female')]
    gender = models.IntegerField(choices=GENDER_CHOICES)
    job = models.CharField(max_length=100, null=True, blank=True)
    user = models.OneToOneField(User, on_delete=models.CASCADE)

class PatientManager(models.Manager):
    def get_queryset(self, *args, **kwargs):
        return super().get_queryset(*args, **kwargs).filter(type=User.Types.Patient)

class Patients(User):
    objects = PatientManager()

    @property
    def more(self):
        return self.patientmore

    class Meta:
        proxy = True

    def save(self, *args, **kwargs):
        if not self.pk:
            self.type = User.Types.Patient
        return super().save(*args, **kwargs)

class DoctorMore(models.Model):
    user = models.OneToOneField(User, on_delete=models.CASCADE)
    specialist_doctor = models.CharField(max_length=100, null=True, blank=True)

class DoctorManager(models.Manager):
    def get_queryset(self, *args, **kwargs):
        return super().get_queryset(*args, **kwargs).filter(type=User.Types.Doctor)

class Doctors(User):
    objects = DoctorManager()

    @property
    def more(self):
        return self.doctormore

    class Meta:
        proxy = True

    def save(self, *args, **kwargs):
        if not self.pk:
            self.type = User.Types.Doctor
        return super().save(*args, **kwargs)

شكرا لكم