SOAP Fault he object has already been deleted or has not been completely created

Hi, i get this error when i try to clone a vm, via perl sdk. this error occurs intermittently, sometimes fails and others it's ok.

The full error is:

12-03 13:30 NACHITO      DEBUG    ('ERR', 'Fault\nSOAP Fault:\n-----------\nFault string: The object has already been deleted or has not been completely created\nFault detail: ManagedObjectNotFoundFault')

vcenter version 4.1 update 2

someone had a similar error or knows what may be?

Best Regards.-