Could someone tell me whats going wrong when I build my lighting?

Open that asset and check the lightmap res. Should be a power of 2. Anything past 1024 is usually getting excessive.

Also drop a lightmass importance volume in the scene and make sure it surrounds it. Should be good for getting rid of that error.

I was able to get rid of all the yellow warnings but still am getting a crash, is there a way to tell what asset might be causing this?