How to delete a VM into a script

Hello,

I want to delete some VM with a VCO script, I would not use the Action element named destroyVM. I explain you why I would not use it, because in my script I make this action :

1. I list all VM into a specific folder that the name is different of ServerName-Today Date and are powered Off.

2. I would destroy each VM into this list.

But When I would just test the following command :

System.getModule("com.vmware.library.vc.vm").destroyVm("VMName");

I receive the following error message :

TypeError: Cannot read property "runtime" from undefined (Dynamic Script Module name : destroyVm#52993)

I search on google and VMware blog, I find nothing to help me !!!!

If someone have an idea, you are welcomed to respond me.

Thank you by advance

Have a nice day

Best Regards

Christophe