0 brushes (totalling 0 sides) discarded from clipping hulls
CreateBrush:
Error: Entity 0, Brush 9, Side 0: plane with no normal
Error: plane with no normal
Description: The map has a problem which must be fixed
Howto Fix: Check the file ZHLTProblems.html for a detailed explanation of this problem
Error: Entity 0, Brush 9, Side 4: has a coplanar plane at (-1977, 633, -330), texture C4A1A_SWMPWL
10%...20%...30%...40%...50%...60%...70%...80%...90%... (0.39 seconds)
Any ideas what this means and how i can fix?