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i am able found out the cause of the error, it was due to the cluster and data store i have used for spawning new VM had some VMs already but as per the openstack documentation it should not contain any existing VM which is created using openstack.

"Clusters: The vCenter driver can support multiple clusters. To use more than one cluster, simply add multiple cluster_name lines in nova.conf with the appropriate cluster name. Clusters and data stores used by the vCenter driver should not contain any VMs other than those created by the driver."

link: http://docs.openstack.org/trunk/config-reference/content/vmware.html