yafaray not rendering

I’m using a Mac and am currently going through the lovely kitchen tutorial from CG tuts, I just got to the part where you render for the first time and I rendered and it rendered a black screen, it didn’t render quickly either, it took some time like it was actually rendering something but all I got was black. Everything else in yafaray has worked fine. I have it set up as an export, and I moved blender out of the apps. folder but put it back bcuz it said to in the install notes for yafaray. Will someone plz help? I will post a .blend file if necisary.

Please, do post a .blend.