502 is "image does not exist", so I guess like Maelstrom says you need .bmp or .jpg after it, just cos windows hides the file extensions doesn`t mean they are not there, DB needs that .bmp or whatever to distinguish that file from mainmenu.mov or mainmenu.mp3 or any other like named files you might just happen to have in your project folder, I like to work with the file extensions visible (you can set it so in control panel) cheers.
Mentor.
ps: if you want to know what the runtime errors mean then go to the db folder, go to the compiler/lang/english then open errors.txt in word, voila! a whole list of the errors and associated descriptions.
PC1: P4 hyperthreading 3ghz, 1gig mem, 2x160gig hd`s, ATI radeon 9800 pro gfx, 6 way surround sound, PC2: AMD 1.2ghz, 512mb ram, FX5200 ultra gfx, stereo 16 bit soundblaster, ups.