Engine Crash Error on Listen Server

[Iroquois]

I try to open up the Zombie Mod using MM:source. I've set it up perfectly according to the instructions. I've also installed the newest version of zombie mod. Now, when I try to bypass the steam overwrite, I connect to CS and it closes promptly after loading the map, with a very irritating message;

"ENGINE ERROR"

That says

"Classname missing from Entity!"

What could this be?

[Glitched System]

I think I've seen something that said not to use a listen server, try a dedicated server


www.srcds.com