Comment 2 for bug 1139684

After I installed a fresh copy of Kilo on Ubuntu 14.04, I have the same problem.
However, after searched, a reference might help on https://www.rdoproject.org/forum/discussion/242/nova-conf-compute_driver-setting/p1

Above link mentioned the driver option, and you can find doc on http://docs.openstack.org/kilo/config-reference/content/list-of-compute-config-options.html

It will let me fix this problem. Hope this will help.