Reality Factory

I can see the leak but i don't know how to fill it
If you know how please tell.
Thanx

A message pops up when i say compile. It says error compile. This is what it says in my text:
** BSP Compile Version: 15
** Build Date/Time: Jan 31 2005,06:32:56
--- Load Brush File ---
Num Solid Brushes : 21
Num Cut Brushes : 0
Num Hollow Cut Brushes : 0
Num Detail Brushes : 0
Num Total Brushes ...