Loading Tiles Offline

[Adidas]

hi, i'm trying to load a new tileset to edit levels offline. i was told to use this code but when i do all the tiles are black, and i'm not able to select them on the side. mafia_tiles.png is in my tiles folder and i have saved the level beginning with mafia_. any suggestions? thanks!

// NPC made by Vin
if (created) {
addtiledef2 mafia_tiles.png,mafia_,0,1;
}
if (playertouchsme) {
}