The passing Error

[Big Whiskey]

Hello everybody,i past some months without playing the passing,so when i Was going to play this message just keep apearing and closing the game and making me go back to the desktop:
5/ - survivor_bot: UTIL_setmodel: not precached: models/survivors/survivor_teenangst.mdl
And also sometimes it changes to survivor_biker something like that

heres my pc configurations

AMD FX(tm)-8150 Eight-Core Processor 3.60 GHz

Ram memory:16,0 GB

Windows 8

PLEASE HELP ME MY GOD!

[Emily]

delete local content of the game from steam library,
then open this folder
C:\Program Files (x86)\Steam\SteamApps\common
then delete left 4 dead 2
wait for awhile
then reinstall the game
enjoy

Misaki Mori.

[Big Whiskey]

Thanks anyway,But i found a solution,i deleted some add-ons and its running.

[NamThunder]

I have the same problem. And it applied to The Sacrifice too.

[Rayman1103]

Yeah this issue is caused by certain add-ons that use an old population.txt file. You'll have to disable/remove the one causing the problem in order to play those campaigns.