I get an Error too, but i move the error box out of the way and I can still work properly with the program and everything is ok. Until i close the eror box because then it closes the program too. Strange, looks like it confuses sth with an error, because as i said program works fine.
Btw, maybe u could insert this kinda feature in the program:
I thought that it would be perfect for making Diplos, by converting world maps to starcraft maps. So i found a black and white simple world map, and converted it, but unfortunately it used misc tiles for it. Maybe u could add a feature that would allow to change simple jpgs to simple maps with just i.e. water for one color and dirt for other? (and isometricaly please)
That would make the program perfect