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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."