TypeError (types.MethodType takes three arguments?) about django-admin-sortable2 HOT 2 CLOSED

Environment:Request Method: GET
Request URL: http://127.0.0.1:8000/

Django Version: 1.6.3
Python Version: 3.4.0
Installed Applications:
('django.contrib.admin',
 'django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.messages',
 'django.contrib.staticfiles',
 'south',
 'adminsortable',
 'mall',
 'cart',
 'customer',
 'product',
 'topic',
 'transaction',
 'wishlist')
Installed Middleware:
('django.contrib.sessions.middleware.SessionMiddleware',
 'django.middleware.common.CommonMiddleware',
 'django.middleware.csrf.CsrfViewMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware',
 'django.contrib.messages.middleware.MessageMiddleware',
 'django.middleware.clickjacking.XFrameOptionsMiddleware',
 'vs.middlewares.SpacelessMiddleware')

Traceback:
File "/some/path/.env/lib/python3.4/site-packages/django/core/handlers/base.py" in get_response101.resolver_match = resolver.resolve(request.path_info)
File "/some/path/.env/lib/python3.4/site-packages/django/core/urlresolvers.py" in resolve333.for pattern in self.url_patterns:
File "/some/path/.env/lib/python3.4/site-packages/django/core/urlresolvers.py" in url_patterns361.patterns = getattr(self.urlconf_module, "urlpatterns", self.urlconf_module)
File "/some/path/.env/lib/python3.4/site-packages/django/core/urlresolvers.py" in urlconf_module356.self._urlconf_module = import_module(self.urlconf_name)
File "/some/path/.env/lib/python3.4/importlib/__init__.py" in import_module104.return _bootstrap._gcd_import(name[level:], package, level)
File "/some/path/vs/vs/urls.py" in <module>7. admin.autodiscover()
File "/some/path/.env/lib/python3.4/site-packages/django/contrib/admin/__init__.py" in autodiscover29.import_module('%s.admin' % app)
File "/some/path/.env/lib/python3.4/importlib/__init__.py" in import_module104.return _bootstrap._gcd_import(name[level:], package, level)
File "/some/path/vs/mall/admin.py" in <module>10. admin.site.register(HomepageItem, HomepageItemAdmin)
File "/some/path/.env/lib/python3.4/site-packages/django/contrib/admin/sites.py" in register95.self._registry[model] = admin_class(model, self)
File "/some/path/.env/lib/python3.4/site-packages/adminsortable/admin.py" in __init__72.self._add_reorder_method()
File "/some/path/.env/lib/python3.4/site-packages/adminsortable/admin.py" in _add_reorder_method129.setattr(self, '_reorder', MethodType(func, self, type(self)))

Exception Type: TypeError at /
Exception Value: method expected 2 arguments, got 3