My game won't launch

[Bacon!]

I can't launch dod: source, it was working just fine yesterday. I keep getting this error when attempting to launch. I would appreciate any help regarding this matter.

 

[Pewww.]

Steams update messed with everyones game, just give it a bit maybe restart, should work after a bit

 

[Puke-N-Snot]

Restart Steam, that should do the job for 'ya.

 

[Bacon!]

OK, thanks!