VMWARE VSphere VIX clone function

Question

I have problem with cloning a virtual machine using VMware VIX api in C#. I am using following code to do so and getting following error.

Code:

VMWareVirtualHost virtualhost = new VMWareVirtualHost();

virtualhost.ConnectToVMWareVIServer("ip", "username", "password");

VMWareVirtualMachine vm = virtualhost.Open("Machine path");

Console.WriteLine("vm is open");

vm.Clone(VMWareVirtualMachineCloneType.Full, "CLone path");

I am getting this error:

operation is not supported.