There are a number of scripts that were broken with the Poser 11 latest updates. I would recommend that you d/l and install AVFix by Snarly, and run it before attempting to run XL. AVFix seems to correct some, but not all, earlier scripts. Be aware, that once the next iteration of Poser is released (Poser 12), many Python Scripts may no longer function due to the new Python 3 version.

https://www.poserlounge.nl/PLWP/fix-for-scripts-in-poser-11-2/