Source error: "too many indices for index buffer...&amp

"too many indices for index buffer. . tell a programmer (32814>32768)"

I'm not precisely sure what this means... can anyone explain? :x

This happened with my latest build of that snow map that I was making - the error appears when i try to run it in CS: Source.

Well... I ended up fixing it by centering the entire map geometry in the middle of the grid, as well as making the entire skybox brush a lot smaller. Guessing it is the brush size limit, I dunno.