Hello, I've been looking around this community for a few days and I decided to make my first script to learn more about programming and runescape scripting more specifically.
 
	The script should be really simple: tanning cowhides into hard leather
 
	I've been following @Explv guide which can be found here: 
 
	I'm stuck at one part, though.
 
	Whenever I trade the NPC (Ellis), the following screen will pop up: