nova-compute-failure

root@bmnova:/etc/nova# nova-compute --verbose
2014-04-17 13:40:09.305 3906 INFO nova.openstack.common.periodic_task [-] Skipping periodic task _periodic_update_dns because its interval is negative
2014-04-17 13:40:09.375 3906 INFO nova.virt.driver [-] Loading compute driver 'libvirt.LibvirtDriver'
2014-04-17 13:40:09.383 3906 ERROR nova.virt.driver [-] Unable to load the virtualization driver
2014-04-17 13:40:09.383 3906 TRACE nova.virt.driver Traceback (most recent call last):
2014-04-17 13:40:09.383 3906 TRACE nova.virt.driver   File "/usr/lib/python2.7/dist-packages/nova/virt/driver.py", line 1115, in load_compute_driver
2014-04-17 13:40:09.383 3906 TRACE nova.virt.driver     virtapi)
2014-04-17 13:40:09.383 3906 TRACE nova.virt.driver   File "/usr/lib/python2.7/dist-packages/nova/openstack/common/importutils.py", line 54, in import_object_ns
2014-04-17 13:40:09.383 3906 TRACE nova.virt.driver     return import_class(import_str)(*args, **kwargs)
2014-04-17 13:40:09.383 3906 TRACE nova.virt.driver   File "/usr/lib/python2.7/dist-packages/nova/openstack/common/importutils.py", line 35, in import_class
2014-04-17 13:40:09.383 3906 TRACE nova.virt.driver     traceback.format_exception(*sys.exc_info())))
2014-04-17 13:40:09.383 3906 TRACE nova.virt.driver ImportError: Class LibvirtDriver cannot be found (['Traceback (most recent call last):\n', '  File "/usr/lib/python2.7/dist-packages/nova/openstack/common/importutils.py", line 31, in import_class\n    return getattr(sys.modules[mod_str], class_str)\n', "AttributeError: 'module' object has no attribute 'LibvirtDriver'\n"])
2014-04-17 13:40:09.383 3906 TRACE nova.virt.driver