Left 4 Dead 2 Engine Error

After 1 December patch for Left 4 Dead 2 in Steam, the game keep crashing when you start after you skip the movie. It will pop up "Engine Error" - Could not load library Client. It seems that there is a missing file at the library for Left 4 Dead 2 in Steam.

There are few options you can TRY :

1) Restart Steam
2) Reinstall Steam
3) Wait for new patch to fix the bug
4) Delete ClientRegistry.blob at steam folder
5) Go to Left 4 Dead 2 properties at steam, then click verify integrity of game cache...

DONE =)