I'm wondering if people have gotten this error before while compiling and if so, how did you fix it? Vrad will crash when it gets to the end on "FinalLightFace"

FinalLightFace: 0...1...2...3.

Yep I had that error aswell. It forced me to start my map over. If there is a fix or a cause im listening...

Actually I think I found the answer (trying it now) here on the dev Wiki:

http://developer.valvesoftware.com/wiki/SDK_Beta_Bugs

Check your func_detail brushes or any weird skewed brushes etc.

Actually sir, I have had it myself!
Sometimes it happened when pulling a brush too far more than 1000, it corrupted the brush, make a new map, Edit > select all copy and paste, start deleting brushses until it compiles. :)

Then when you find out what's doing it, get the brush delete it remake it then recompile.

I would delete full houses at a time until it works.

The error isn't just related to func_details, I've had that error and had to compile little sections of the map using the cordon tool until I had found the area that was causing the problem, it ended up being to pieces of water that where somehow conflicting with the compile process. I deleted them and redid them and it compiles.
Best option is using the cordon tool to compile little areas at a time, this way its fast and will tell you quicker if its that certain bit you're doing thats causing the problem.

Also I've been told this is the sample xxx bug aswell?