VMClone: The operation is not supported on the object.

I use Java in the sample VMclone class and submitted to the mistake, how to solve?

Cloning Virtual Machine [xp001] to clone name [copyxp001]

java.lang.RuntimeException: The operation is not supported on the object.
    at com.vmware.vm.VMClone.getTaskResultAfterDone(VMClone.java:256)
    at com.vmware.vm.VMClone.cloneVM(VMClone.java:406)
    at com.vmware.vm.VMClone.main(VMClone.java:642)

CloneVM_Task operation is not supported on ESX Server but it is available on VC, Virtual Center?

In order, to be able to run VMClone sample, i should connect to the VC Server?

How to connect to VC Server?