ERROR nova.virt.driver [-] Compute driver option required, but not specified

installed nova-2013.1.g3, and when attempting to run 'nova-compute' with valid options..getting error "ERROR nova.virt.driver [-] Compute driver option required, but not specified"

nova.conf has the ‘compute_driver’ specified. I tried both options VMWareESXDriver and VMWareVCDriver..but no luck. May be I am missing a minor step here. Appreciate any help.

root@esxs2012:~# nova-compute --config-dir=/etc/nova/nova.conf --log-dir=/var/log/nova --verbose --debug
2013-03-02 05:07:26 2296 ERROR nova.virt.driver [-] Compute driver option required, but not specified
root@esxs2012:~# grep vmware /etc/nova/nova.conf
compute_driver=vmwareapi.VMWareVCDriver
#compute_driver: vmwareapi.VMWareESXDriver or vmwareapi.VMWareVCDriver
#:vmwareapi_host_ip: IP address or Name of VMware ESX/VC server.
#:vmwareapi_host_username: Username for connection to VMware ESX/VC Server.
#:vmwareapi_host_password: Password for connection to VMware ESX/VC Server.
#:vmwareapi_cluster_name: Name of a VMware Cluster ComputeResource.
#:vmwareapi_task_poll_interval: The interval (seconds) used for polling of remote tasks (default: 5.0).
#vmwareapi_api_retry_count: The API retry count in case of failure such as network failures (socket errors etc.) (default: 10).
#vmwareapi_cluster_name: When compute_driver is vmwareapi.VMWareVCDriver
vmwareapi_host_ip=10.49.202.48
vmwareapi_host_username=sysdep
vmwareapi_host_password=xxxxxxx
vmwareapi_wsdl_loc=http://127.0.0.1:8080/vmware/SDK/vsphere-ws/wsdl/vim25/vimService.wsdl
vmwareapi_vlan_interface="vmnic0"
vmware_vif_driver="nova.virt.vmwareapi.vif.VMWareVlanBridgeDriver"
root@esxs2012:~#

I was told to you change from VMWareVCDriver/VMWareESXDriver to VMwareVCDriver/VMwareESXDriver..but still having same error message.

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