.Map :: MoHAA Mapping

When compiling, MBuilder displays this:
******************ERROR*****************
Compressing light grid... MAX_MAP_LIGHTGRIDDATA <2097512 bytes> exceeded

Can someone help me?

Have you got a very large map?

Mohlight can't handle very large lightmaps. Set de lightmapdensity key in the worldspawn to about 128 and you should be fine. You decrease that value later. Also try to caulk all unseen faces.