Rendering Vray SketchUp - Lines Appearing On Walls

As you can see, there are lines appearing on my walls. How can I avoid these from showing?

I am new to rendering in Vray, so perhaps I am not selecting something I need to in the rendering settings. There are 4 rectangle lights on the ceiling and I increased the exposure of the rendering.

Try uploading your model here. It’s very hard to know for sure without seeing the material, light and/or overall render settings.