Quote from HipshotHmm, I had no issues compiling and playing the level with bots
bspc.exe -bsp2aas dmdn.bsp -forcesidesvisible -optimize
I tried making a simple room with 2 rooms and hallway, spawnpoints and a weapon and then I've got an .AAS... So that means the method should work.
But on the other hand you managed to get one... What compile options did you use to create a bsp?