@ccc , no I didn't. Was not the point of the post really. As I said I don't have a need for it. I just wanted to understand why it wasn't working. But with your and omz posts, it's clear why it does not work. I just went on to make the further point that it could have failed a better way with a different expection error. Or it could have possibly run but issued a warning like 'sub processes not supported, running a single process'. Or something like that