This error is always caused by vertex manipulation. A plane is defined by 3 unique coordinates. If any of the three coordinates are the same, then you don't really have a plane (its either a line or a point). There is no way to fix this error other than to delete the brush and recreate it completely.Well ok so i did that to one brush, brush 156; entity 0, side 9.
exported to .map, compiled.. same error. same brush, same side.
Went back to hammer searched for the brush, and a different brush popped up. So i said.. wtf.. deleted, re-created, and recompiled.
same thing. same brush number, side, entity.. everything.
did that again like 6 times. and the thing is all the brushes that the log file is reporting have been made with the brush tool. I havent touched any of them with the VM tool, or even the clip tool.
Alt+P isn't reporting anything either.
This is bugging the CRAP outta me. Any suggestions?