I have bought and downloaded the Old School Geomorphic tile set. I then set up the API for creating the map layer, dynamic layer, etc. I then created the rollable table and properly named all the pieces, weights, and so on. My issue is that when I click on Create Map Layer, I get the following error in the API console: "ERROR: Please use the 'thumb' size for imgsrc properties." Can anyone hopefully assist with what I need to do for the script to work?