Open Stack

 The compute service can not start when I run ' /usr/bin/python
/usr/bin/nova-compute --logfile /var/log/nova/compute.log '.  The
error message is :

Traceback (most recent call last):
  File "/usr/bin/nova-compute", line 10, in <module>
    sys.exit(main())
  File "/usr/lib/python2.6/site-packages/nova/cmd/compute.py", line 59, in main
    config.parse_args(sys.argv)
  File "/usr/lib/python2.6/site-packages/nova/config.py", line 38, in parse_args
    rpc.init(cfg.CONF)
  File "/usr/lib/python2.6/site-packages/nova/rpc.py", line 63, in init
    aliases=TRANSPORT_ALIASES)
  File "/usr/lib/python2.6/site-packages/oslo/messaging/transport.py",
line 185, in get_transport
    raise DriverLoadFailure(url.transport, ex)
oslo.messaging.transport.DriverLoadFailure: Failed to load transport
driver "rabbit": No 'oslo.messaging.drivers' driver found, looking for
'rabbit'

I have already installed rabbitmq-server. And I configured
"rpc_backend=nova.openstack.common.rpc.impl_kombu" in nova.conf
because controller node is configured that. Could someone  helps me?
Thanks a lot!