I looked at the script download and I'm seeing it as this
def devour(user, item)Why does yours say is_devour_skill?
target, user, devour_ok = self, user, false
target, user = user, @subject if LiTTleDRAgo::VXA
if item.is_a?(RPG::Skill) && devour_skill?(item) && user.is_a?(Game_Actor)
Also, line 5185 in Scene_Debug? Exactly how are you inserting scripts?