Django FormWizard com modelos diferentes

estou a tentar usar FormWizard para fazer um registo para novos utilizadores. Porque em alguns passos eu precisaria usar js, formsets, e fotos, eu decidi fazer um modelo diferente para cada passo. Mas então eu tenho um erro:

ValidationError at /registration_steps
[u'\u0414\u0430\u043d\u043d\u044b\u0435 ManagementForm \u043e\u0442\u0441\u0443\u0442\u0441\u0442\u0432\u0443\u044e\u0442 \u0438\u043b\u0438 \u0431\u044b\u043b\u0438 \u0438\u0441\u043a\u0430\u0436\u0435\u043d\u044b.']

Forms.py

class ApplicantForm1(forms.ModelForm):
    password1 = forms.CharField(
        label='Password',
        widget=forms.PasswordInput
    )
    password2 = forms.CharField(
        label='confirm',
        widget=forms.PasswordInput
    )
    travel_passport = forms.ChoiceField(
        choices=((False, 'Нет'), (True, 'Да')),
        widget=forms.Select
    )
    def clean_password2(self):
        password1 = self.cleaned_data.get('password1')
        password2 = self.cleaned_data.get('password2')
        if password1 and password2 and password1 != password2:
            raise forms.ValidationError('Passwords dont match')
        return password2

    def save(self, commit=True):
        user = super(ApplCreaForm, self).save(commit=False)
        user.set_password(self.cleaned_data['password1'])
        user.isempl=0
        if commit:
            user.save()
        return user
    class Meta:
        model = ExtUser
        fields = ['email','firstname', 'lastname', 'middlename', 'date_of_birth', 'gender', 'family_position',
                  'driver_license', 'driver_license_category',]

class ApplicantForm2(forms.ModelForm):
    class Meta:
        model = ExtUser
        fields = ['country','region','city', 'nearcity', 'travel_passport', 'travel_passport_end_date','metro', 'mobile_sms', 'mobile_double', 'email_double',
                  'web', 'vkontakte', 'facebook','odnoklasniki','skype','whatsapp','viber','ready_to_move','ready_to_move_where',]

Views.py

FORMS_REG = [("reg_step1", ApplicantForm1),
         ("reg_step2", ApplicantForm2),
        # ("ApplicantForm3", ApplicantForm3),
        # ("ApplicantForm4", ApplicantForm4),
        # ("ApplicantForm5", ApplicantForm5),
        # ("ApplicantForm6", ApplicantForm6),
        # ("ApplicantForm7", ApplicantForm7),
        ]         

TEMPLATES_REG = {"reg_step1": "registration_steps/reg_step1.html",
             "reg_step2": "registration_steps/reg_step2.html",
             #"reg_step3": "registration_steps/reg_step3.html",
             #"reg_step4": "registration_steps/reg_step4.html",
             #"reg_step5": "registration_steps/reg_step5.html",
             #"reg_step6": "registration_steps/reg_step6.html",
             #"reg_step7": "registration_steps/reg_step7.html",
             }

class ApplicantWizard(SessionWizardView):
    instance = None
    def get_template_names(self):
        return [TEMPLATES_REG[self.steps.current]]
    def get_form_instance( self, step ):
        if self.instance is None:
            self.instance = ExtUser()
        return self.instance
    def done(self, form_list, **kwargs):
        self.instance.save()
        return render_to_response('app/successpage.html', {
            'title':"Registration complited" ,
        })

Urls.py

 url(r'^registration_steps$', ApplicantWizard.as_view(FORMS_REG)),

modelos reg_step1.html e reg_step2.html (para agora eles são os mesmos)

{% extends "layout/layout_main.html" %}

{% block content %}
<p> Step {{ wizard.steps.step1 }} of  {{ wizard.steps.count }}</p>
{% for field in form %}
    {{field.error}}
{% endfor %}

<form action="" method="post">{% csrf_token %}
<table>
{{wizard.managment_form}}
    {{ wizard.form }}
</table>
{% if wizard.steps.prev %}
<button name="wizard_goto_step" type="submit" value="{{ wizard.steps.first }}">"first step"</button>
<button name="wizard_goto_step" type="submit" value="{{ wizard.steps.prev }}">"prev step"</button>
{% endif %}

<input type="submit" value="Submit" />
</form>
{% endblock %}