See:
Huge loving post on this page.
To sum it up:
Get:
Emote_Critical
Weapon_Sword (I don't loving know why it's gone in the first place)
Change the usage of
Event_Zones
Redownload:
Event_SetTransform
Gamemode_Zombies
T+T2.1
Remove:
completly unused add-ons
Maybe remove:
the crossbow (exact error shows up on my local server as well, though)
Enable:
Weapon_Package_Tier1/1A/2/2A
Disable the Sniper_Rifle.
Kaye's Sniper is not activated or even on the server. That is what causes an "error". If that is what is responsible for the problem, I doubt. We can still try enabling it, though.
Try disabling sports balls.
Just out of curiosity, why?
What would the balls break/collide with.
Are you guys by any chance using a modded Gamemode_Zombie?
Can't speak for Portal, but I heavily doubt it.