erro no makemigrations

Olá! Não consigo realizar o makemigrations e não encontro o erro...

erro

Traceback (most recent call last):
  File "manage.py", line 10, in <module>
    execute_from_command_line(sys.argv)
  File "C:\Python27\lib\site-packages\django\core\management\__init__.py", line 385, in execute_from_command_line
    utility.execute()
  File "C:\Python27\lib\site-packages\django\core\management\__init__.py", line 354, in execute
    django.setup()
  File "C:\Python27\lib\site-packages\django\__init__.py", line 21, in setup
    apps.populate(settings.INSTALLED_APPS)
  File "C:\Python27\lib\site-packages\django\apps\registry.py", line 108, in populate
    app_config.import_models(all_models)
  File "C:\Python27\lib\site-packages\django\apps\config.py", line 202, in import_models
    self.models_module = import_module(models_module_name)
  File "C:\Python27\lib\importlib\__init__.py", line 37, in import_module
    __import__(name)
  File "C:\Users\jojih\Desktop\connectedin\perfis\models.py", line 14, in <module>
    class Convite(models.Model):
  File "C:\Users\jojih\Desktop\connectedin\perfis\models.py", line 20, in Convite
    self.solicitante.contatos.add(self.convidado)
NameError: name 'self' is not defined

urls.py:

from django.conf.urls import patterns, url
from django.contrib import admin
from perfis import views

urlpatterns = patterns('',
    url(r'^$', views.index, name='index'),
    url(r'^perfis/(?P<perfil_id>\d+)$', views.exibir, name='exibir'),
    url(r'^perfis/(?P<perfil_id>\d+)/convidar$', views.convidar, name='convidar'),
    url(r'^convite/(?P<convite_id>\d+)/aceitar$', views.aceitar, name='aceitar')

)

views.py:

from django.shortcuts import render, redirect
from django.http import HttpResponse
from perfis.models import Perfil, Convite
def index(request):
    return render(request, 'index.html',{ 'perfis' : Perfil.objects.all(), 'perfil_logado' : get_perfil_logado(request)})

def exibir(request, perfil_id):
    perfil = Perfil.objects.get(id=perfil_id)    
    return render(request, 'perfil.html', {'perfil' : perfil, 'perfil_logado' : get_perfil_logado(request)})

def convidar(request, perfil_id):
    perfil_a_convidar = Perfil.objects.get(id= perfil_id)
    perfil_logado = get_perfil_logado(request)
    perfil_logado.convidar(perfil_a_convidar)
    return redirect ('index')

def aceitar(request, convite_id):
    convite = Convite.objects.get(id=convite_id)
    convite.aceitar()
    return redirect('index')


def get_perfil_logado(request):
    return Perfil.objects.get(id=1)

models.py:

from django.db import models

class Perfil(models.Model):
    nome = models.CharField(max_length=255, null=False)
    email = models.CharField(max_length=255, null=False)
    telefone = models.CharField(max_length=100, null=False)
    nome_empresa = models.CharField(max_length=255, null=False)
    contatos = models.ManyToManyField('self')


    def convidar(self, perfil_convidado):
        Convite(solicitante=self, convidado=pefil_convidado).save()

class Convite(models.Model):
     solicitante = models.ForeignKey(Perfil, related_name='convites_feitos')
     convidado = models.ForeignKey(Perfil, related_name='convites_recebidos')

     def aceitar(self):
         self.convidado.contatos.add(self.solicitante)
        self.solicitante.contatos.add(self.convidado)
        self.delete()

index.html:

{% extends "base.html" %}

{% block body %}
<div class="col-lg-12">
    <div class="panel panel-default">
        <div class="panel-heading">
            <strong>Todos os Perfis</strong>
        </div>
        {% if perfis %}
            <ul>
                {% for perfil in perfis %}
                    <li>
                        <a href="{% url 'exibir' perfil.id %}">{{ perfil.nome }}</a> / {{ perfil.email }}
                    </li>
                {% endfor %}
            </ul>
        {% else %}
            <p>Nenhum Perfil encontrado</p>
        {% endif %}
    </div>