Error Ordering can't span tables on non-relational backends

[bobhsr]

Django Environment:

django-nonrel-1.5-beta
django-mongodb-engine-1.5-beta
djangotoolbox-1.5-beta
OS: Ubuntu VirtualEnv

I am getting the following error while doing initial sync:

python manage.py syncdb
Creating tables ...
/../django-mongodb-engine/django_mongodb_engine/query.py:3: DeprecationWarning: A() queries are deprecated as of 0.5 and will be removed in 0.6.
  DeprecationWarning)

DatabaseError: Ordering can't span tables on non-relational backends (content_type__app_label).

[nohackcc]

I have the same problem. How to solve this problem?
Thank you.