L4D2 HLDJ

[ineedhelp]

Could someone tell me why HLDJ will not work? All I get is "unknown command: la".

I'm on Win 7 64 bit

Game directory: C:\Program Files (x86)\Steam\steamapps\common\left 4 dead 2\left4dead2

Audio Directory: C:\Program Files (x86)\Steam\steamapps\common\left 4 dead 2\left4dead2\sound\music\hldj