Does anyone know why parts of my wall are black?

I threw in a material on the walls to see how the color looked with the dark floors, once i changed the scene from unlit to lit i noticed certain parts on the walls in my scene are all black, I haven’t had this problem before and I changed the UVs just to see if that fixed it, but nothing.
Screen Shot 2016-02-03 at 12.42.06 PM.pngScreen Shot 2016-02-03 at 12.42.27 PM.pngScreen Shot 2016-02-03 at 12.43.05 PM.png

It looks like you use movable directional light only…so that means you don’t have any global illumination (or indirect illumination).

Add a skylight to add G.I