For people who are struggling to use this script and do want a working Fletching script, there was one released in the "First Scripts" thread by Annonymus - https://villavu.com/forum/showthread.php?t=110328 a while back.
This does work for all logs apart from Yews and Magics however you can add support for these logs yourself by creating a few bitmaps which is very easy to do if you have a quick read of Cycrosism's guide here https://villavu.com/forum/showthread.php?t=47374. Sorry if this is inappropriate to post here however I hope it will stop so many questions asking how to fix this script and instead encourage others to learn a little themselves