Industrial craft crash on server

I'm hosting a server with industrial craft mod installed + buildcraft.
but if I equip a jetpack or rubber boots on the server my game will crash and I have to delete the player file to rejoin.
I hope you can help me, thanks.
here is the error
http://i.imgur.com/pdgnj.png
ps:
and you guys said that you need to change things in the config
http://wiki.industrial-craft.n…p?title=Download#Download
at the FAQ sheet

Quote from RichardG

Get the client error report, using this tool:

https://github.com/downloads/m…craftError/MCErrorV25.jar

what do i need to do with that program?

Quote from RichardG

Second one asking that today... Run it by doubleclicking

Checking for Minecraft launcher (minecrafterr.jar) in C:\Users\NICO\AppData\Roaming\.minecraft\minecrafterr.jar
Minecraft launcher found!
Starting launcher...
27 achievements
174 recipes
ModLoader 1.1 Initializing...
Mod Initialized: mod_ModLoaderMp 1.1
Mod Initialized: mod_MinecraftForge 1.3.3.12
Mod Initialized: mod_BuildCraftCore 2.2.12
Mod Initialized: mod_BuildCraftBuilders 2.2.12
Mod Initialized: mod_BuildCraftEnergy 2.2.12
Mod Initialized: mod_BuildCraftFactory 2.2.12
Mod Initialized: mod_BuildCraftTransport 2.2.12
MinecraftForge v1.3.3.12 Initialized
Mod Initialized: mod_IC2 v1.64
Mod Loaded: mod_ModLoaderMp 1.1
Mod Loaded: mod_MinecraftForge 1.3.3.12
Mod Loaded: mod_BuildCraftCore 2.2.12
Mod Loaded: mod_BuildCraftBuilders 2.2.12
Mod Loaded: mod_BuildCraftEnergy 2.2.12
Mod Loaded: mod_BuildCraftFactory 2.2.12
Mod Loaded: mod_BuildCraftTransport 2.2.12
[IC2] Config loaded from C:\Users\NICO\AppData\Roaming\.minecraft\config\IC2.cfg
[IC2] Using 32 audio sources.
ModLoaderMP 1.0.0 Initialized
Mod Loaded: mod_IC2 v1.64
Starting BuildCraft 2.2.12
Copyright (c) SpaceToad, 2011
http://www.mod-buildcraft.com
[IC2] Trying to load IC2 submodule: bcIntegration31x
[IC2] Can't load submodule: java.lang.reflect.InvocationTargetException
[IC2] Trying to load IC2 submodule: bcIntegration22x
[IC2] BuildCraft integration module loaded
[IC2] Trying to load IC2 submodule: cgIntegration14x
[IC2] Can't load submodule: java.lang.reflect.InvocationTargetException
[IC2] Trying to load IC2 submodule: neiIntegration11x
[IC2] Can't load submodule: java.lang.reflect.InvocationTargetException
Done.
WARNING: Found unknown Windows version: Windows 7
Attempting to use default windows plug-in.
Loading: net.java.games.input.DirectAndRawInputEnvironmentPlugin

Starting up SoundSystem...
Initializing LWJGL OpenAL
(The LWJGL binding of OpenAL. For more information, see http://www.lwjgl.org)
OpenAL initialized.

Connecting to 84.105.186.168, 25565
Stopping!

SoundSystem shutting down...
Author: Paul Lamb, www.paulscode.com

18-feb-2012 15:18:46 forge.ForgeHooks <clinit>
INFO: MinecraftForge v1.3.3.12 Initialized

java.lang.AbstractMethodError: ic2.common.ItemArmorLappack.getArmorDisplay(Lxb;Lyq;I)I
at agq.a(GuiIngame.java:116)
at kz.b(EntityRenderer.java:763)
at EntityRendererProxy.b(EntityRendererProxy.java:15)
at net.minecraft.client.Minecraft.x(SourceFile:742)
at net.minecraft.client.Minecraft.run(SourceFile:662)
at java.lang.Thread.run(Unknown Source)
Error report complete.
the program says this

Error report complete.

Here's my guess as to what went wrong:

Hm, I can't seem to figure it out. If your client failed to load press Paste Error and show that link to #Risucraft on esper.net
Posting to pastebin.com...
http://pastebin.com/wPd16qjC

Quote from RichardG

Downgrade to this older Forge version: http://lexmanos.no-ip.org:8080/job/Forge/4

it doesnt work the server chrashes now if i join
error report http://filebeam.com/7231fc535bd942f755e89431e33b628b.jpg

Quote from RichardG

This error can be safely ignored

thank you richard for this awesome mod it finally works so thank you
kind regards from the netherlands