help!

hi, I am working on something and I need to change the map to view it correctly. I use the command

"if (playerenters) {setmap thtmap.png,thtmap.txt,1.5,3.8}"

yet literally nothing happens, even though I made a map text file with the generator, and a map my pressing "M" in the level generator. Well, I suppose the text file is being loaded properly then, but the map isn't displaying differently.