Minecraft Forums

So, I have an annoying issue where when a friend of mine joins my server, it kicks us both out and shuts the server down.

Running version 1.6.4 with MCPC and several mods.

Agriculture
Ars Magica 2
Applied Energistics
Alternate Terrain Generator
Backpacks
Biblio Craft (plus addons for Biomes o Plenty and Natura)
Biomes o Plenty
Carpenter's Blocks
Chisel
Code Chicken Core
Computer Craft
Dr Zark's MoCreatures
Ender Storage
Extra Utils
Greg's Lighting
Greg Tech
Hats
industrial Craft 2 Experimental
Inventory Tweaks
Mad Science
Mekanism (plus all relevant addons)
Modular Force Field System
Modular Pots
Module Powersuits (plus the addon)
Morph
Natura.
NEI (plus all relevant addons)
Open Blocks (plus all relevant addons)
Steve's Carts 2
Tinker's Construct (plus the Steel and Mechworks addon)
Thaumcraft (plus the Thaumic Tinkerer addon)
Traincraft
Twilight Forest
Universal Electricty
Waila

And the error log: http://pastebin.com/WXeBAZgc

Help? :\