Use a 4 Axis Robot Positioner with OLP

Hi,

I am simulating an application where my robot positioner has 4 axis. I modelled it using the external axis wizard and it seems to be working as I can jog all 4 joints after a connect it to my robot.

But when I try to create a Weld statement I get the following error: Traceback (most recent call last):
File “Name::SeamPath”, line 56483, in OnStart
File “Name::SeamPath”, line 13131, in setUp
IndexError: list index out of range

Is there a fix for it?