Portalnum greater than numareaportals

Portalnum > numareaportals

You may get this Engine Error if your BSP compile process has failed to correctly compile areaportals.

How to fix

It can be fixed by using the Auto vis and hiding all non solid geometry, except areaportals, and looking for all holes that is between the two or more seperated areas of the map. The brushnumber returned by the bsp log, will not report where the hole is, however, it may point out which portal is bugged.