Infinzxt

I am very new to this so sorry if I overlooked the answer for this or if its obvious. I am creating a test world to learn the ropes of making maps. I paste my world .bmp file into WorldEd. When setting up TileZed and WorldEd I linked it to the extracted tileset folder from April this year. When I try to convert to TMX I get the error below. How do I fix this? Thanks.