Weird Error

[Meyer]

This morning I was happily mapping... then I went to school and when I came back I can't start up the SDK anymore... I can start up Steam but when I click on the SDK it starts loading very long and eventually gives me this error... all I can click is 'ok'...

Mount Filesystem( 206 )failed: SteamMountFilesystem(3216,206,0x419fd0c) failed with error 116: Cache needs repair

 

[The Dark Elf]

cache is corrupt. try validating it, should fix it. Or do a search as a few people have had that error.

 

[Meyer]

cache is corrupt. try validating it, should fix it. Or do a search as a few people have had that error.

and how do I validate it?

::edit:: never mind, found it... thx