exportselected() isn't a command, it looks like it's a global procedure. You might have a script in your preferences or startup that this is referencing.
Here is my layout of the War base. Got a wardesk and a global ball. I got 2 floors. You can reach the second floor by taking the elevator. There you'll find a capsule. ~
Hmm, I tried that and it didn't solve the problem. A co-worker recommended changing the ambient light (rendering > enviornment > global lighting > ambient) to a dark gray instead of black. Works perfectly!
turn off all lights and globals and just "paint" with one light at a time with vray just throw 1 or 2 big area lights in the scene and that should be all you need.