ive checked and havnt seen anything i even made a new skybox and stilll nothing :(

Have you entered your worldspawn settings?
does your compile log say: ****** leaked ***** anywhere?
Post your compile log if you're not sure.

yep it does ******Leaked******
:(

Open your map in Radiant
go to File->Pointfile

that will display a red line going through the leak in your skybox..

I also have a Leaked Problem. And when i did Pointfil, nothing happens. How is that possible?

(CoD2) A while back I had a .lin file generated, so I knew I had a leak. Pointfile didn't work for me either. I had a model that stuck out of the skybox. It was a bridge. I have no clue what the hangy down thing on it was, but it was outside.
Hope this helps.

No not really cause i changed my skybox. I made it bigger and i still had the problem. And it still says ****LEAKED****

It's very easy to inadvertently choose a skybox brush while manipulating stuff. I have my best luck looking for skybox leaks from the outside. I make sure all the exterior brush sides are caulk and visit the outside corners. Even a smidge of a grey line is death. (This is also why I never miter my corners. I want those junctions visible.)
I've had to completely redo mine a couple of times. When that happens I set snap to grid at 16 or higher.
It's frustrating to redo, but it really doesn't take that long.