Django 1.5: Understanding of AbstractBaseUser and permissions

I created an user app `MyUser` which is an extension of `AbstractBaseUser`. I was under the impression that the model `MyUser` will replace the standard `Auth.User`, as long as it is mentioned in `settings.py` AUTH_PROFILE_MODULE = 'profile.MyUser' My trouble is now that I can't set the permissions for users registered in the MyUser model. When I try to set the group memberships and permissions, I get the error `User' instance expected, got <MyUser: username>`. How can I add users of my user model to the permissions and correct groups? ``` class MyUserManager(BaseUserManager): def create_user(self, username, email, phone, password=None, company=False): if not email: raise ValueError('Users must have an email address') if not username: username = email.split('@')[0] user = self.model( email=MyUserManager.normalize_email(email), username=username,phone=phone,) user.set_password(password) user.save(using=self._db) # add to user group and set permissions if company: g = Group.objects.get(name='company') p = Permission.objects.get(codename='add_company') else: g = Group.objects.get(name='user') p = Permission.objects.get(codename='add_user') g.user_set.add(user) user.user_permissions.add(p) return user class MyUser(AbstractBaseUser): username = models.CharField(max_length=254, unique=True, blank=True, null=True) email = models.EmailField(max_length=254, unique=True, db_index=True) phone = models.CharField(_('Phone Number'), max_length=25, blank=True, null=True,) is_active = models.BooleanField(default=True) is_admin = models.BooleanField(default=False) USERNAME_FIELD = 'email' REQUIRED_FIELDS = ['phone'] objects = MyUserManager() def get_full_name(self): return self.email ... ```