Engine Error E041 Help!

I am making some Terrains for a very Huge level and have ran into this severe error and it won't build past it! I am going to post a screen shot. Can someone please help?


Thank you!

Light_Mystic.

The lightmap space of 16mb is overrun... Delete lights and try to avoid large shaded blocks!

Maybe even try to contact conitec.. they wanted to delete this error message long time ago.. (replace it with a warning)

TripleX