Can't play the game

This isn’t a problem about steam, it’s the game.
Whenever I’m trying to play after the crash, it says game is unavailable.
This isn’t with other games, just garry’s mod and garry’s mod beta 13.
Did something happen to cause that? Because I can’t play it all.
Anyone else having this problem, and also, please help me.

[editline]23rd July 2012[/editline]

fixed now, lock please

How did you fix it?

Post it just in case.

Usually, restarting Steam or changing your download server fixes the “Game is unavailable” issue. Glad you fixed it!

Yeah, did that, worked perfectly fine.