Zombies won't die

[Nate_the_Great]

When i start a mini-game with zombies, they can hurt me but I cant hurt them. What the problem and how can i fix this.

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[Dapizzanator]

You using the Survivor playertype?

[CHEESE]

Self Damage: This must be enabled.

[Vidios]

In Rotondo's zombie mod (Gamemode_zombie.zip) you have to have vehicle damage on. Weapon damage is optional, it controls friendly fire.
I have no idea if self damage plays a role though.