Ok so I just waiting a long 11 hrs for Radiosity to do it's job, and as soon as it was done, I saved it and so on. I was able to finally move around to check out the level for bad spots/areas.
Well now all of a sudden I get this and every time I move the camera above the floors it crashes...
It was fine 10 minutes ago and now this happens. Any help would be great thanks!

paste the last paragraph of debug.txt here.

That's the problem too also...I can't find the debug file in the HCE directory, makes no sense to me, I've done this stuff a thousand times (Not literally) and never had any trouble...

I got it figured out already, for some reason I thought my background sound wasn't working, so I deleted it from the bsp. When I reopened the scenario, I got this error. I tried opening it 2 more times got the same thing, added the sound back into the bsp, and it worked again. It was kinda weird, I'm also running on win7 now as I mentioned to some people I another post, and some stuff didn't work and I had to find fixes and make changes in my system to make things work.