Are you by any chance attempting to set a spell which is not a strike, bolt, blast or wave? The script only works with strikes, bolts, blasts and waves (the 16 standard spells) as that's what most people use and are cost efficient, I will expand it to use special spells such as Iban's Blast, Crumble Undead and the other spellbooks in the future, but those quests are generally completed with earth strike as it's very cheap and effective.EDIT: if the script no longer starts so that you can remove the presets which have invalid settings, go to C:\Users\Daniel\Documents and delete the folder called StealthProject. I will update the script to verify its data files so that this error doesn't occur anymore.