django-testapp (cannot import name JOIN_TYPE)

Traceback (most recent call last):

  File "C:\Program Files (x86)\Google\google_appengine\google\appengine\runtime\wsgi.py", line 196, in Handle

    handler = _config_handle.add_wsgi_middleware(self._LoadHandler())

  File "C:\Program Files (x86)\Google\google_appengine\google\appengine\runtime\wsgi.py", line 266, in _LoadHandler

    __import__(cumulative_path)

  File "P:\img\django-testapp-testapp-1.4\djangoappengine\main\__init__.py", line 59, in <module>

    validate_models()

  File "P:\img\django-testapp-testapp-1.4\djangoappengine\main\__init__.py", line 47, in validate_models

    num_errors = get_validation_errors(s, None)

  File "P:\img\django-testapp-testapp-1.4\django\core\management\validation.py", line 35, in get_validation_errors

    for (app_name, error) in get_app_errors().items():

  File "P:\img\django-testapp-testapp-1.4\django\db\models\loading.py", line 166, in get_app_errors

    self._populate()

  File "P:\img\django-testapp-testapp-1.4\django\db\models\loading.py", line 72, in _populate

    self.load_app(app_name, True)

  File "P:\img\django-testapp-testapp-1.4\django\db\models\loading.py", line 96, in load_app

    models = import_module('.models', app_name)

  File "P:\img\django-testapp-testapp-1.4\django\utils\importlib.py", line 35, in import_module

    __import__(name)

  File "P:\img\django-testapp-testapp-1.4\autoload\models.py", line 5, in <module>

    import_module(SITECONF_MODULE)

  File "P:\img\django-testapp-testapp-1.4\django\utils\importlib.py", line 35, in import_module

    __import__(name)

  File "P:\img\django-testapp-testapp-1.4\indexes.py", line 2, in <module>

    autodiscover()

  File "P:\img\django-testapp-testapp-1.4\dbindexer\__init__.py", line 3, in autodiscover

    auto_discover('dbindexes')

  File "P:\img\django-testapp-testapp-1.4\autoload\__init__.py", line 14, in autodiscover

    import_module('%s.%s' % (app, module_name))

  File "P:\img\django-testapp-testapp-1.4\django\utils\importlib.py", line 35, in import_module

    __import__(name)

  File "P:\img\django-testapp-testapp-1.4\djangoappengine\dbindexes.py", line 5, in <module>

    from dbindexer.api import register_index

  File "P:\img\django-testapp-testapp-1.4\dbindexer\api.py", line 3, in <module>

    from .resolver import resolver

  File "P:\img\django-testapp-testapp-1.4\dbindexer\resolver.py", line 41, in <module>

    resolver = Resolver()

  File "P:\img\django-testapp-testapp-1.4\dbindexer\resolver.py", line 10, in __init__

    'dbindexer.backends.FKNullFix')))

  File "P:\img\django-testapp-testapp-1.4\dbindexer\resolver.py", line 14, in load_backends

    self.backends.append(self.load_backend(backend))

  File "P:\img\django-testapp-testapp-1.4\dbindexer\resolver.py", line 22, in load_backend

    % (module_name, e))

ImproperlyConfigured: Error importing backend module dbindexer.backends: "cannot import name JOIN_TYPE"

INFO     2013-08-28 01:28:52,329 server.py:593] default: "GET /_ah/warmup HTTP/1.1" 500 -