During VM creation by importing OVF template it's throwing the above exception.
It's exactly failing during that waitForValues method execution which is the immediate call after importVApp() due to soap fault exception.
Also this method only will check whether the importVApp is successful or not.
Solution,
So to resolve this one, I was assuming the importVApp is successful without calling waitForValues method also wait for 2sec's (Here problem may come if OVF import is not complete) before calling for getEntityProps.
Basically I avoided waitForValues method execution.
In my case it was running fine.