Roof textures wont load at all.

Hello, I have been trying to make roof textures for almost a week now, but everytime I have tried to load them (in game), the textures just turn out pure white. 


I have been trying to match my roofs with my walls but nothing seems to be working. I've tried messing with the LOD and the other textures and the materials and the angels, but nothing does work. I don't want to give up on this.