Server Error, my mod loader is not working properly

[ColonelEagleman]

This is my problem:

 

C:UsersAnthonyDesktopServer>java -Xmx3G -Xms2G -jar Tekkit.jar nogui
Dec 09, 2014 4:20:49 PM net.minecraft.launchwrapper.LogWrapper log
INFO: Loading tweak class name cpw.mods.fml.common.launcher.FMLServerTweaker
Dec 09, 2014 4:20:49 PM net.minecraft.launchwrapper.LogWrapper log
INFO: Using primary tweak class name cpw.mods.fml.common.launcher.FMLServerTweak
er
Dec 09, 2014 4:20:49 PM net.minecraft.launchwrapper.LogWrapper log
INFO: Calling tweak class cpw.mods.fml.common.launcher.FMLServerTweaker
2014-12-09 16:20:49 [iNFO] [ForgeModLoader] Forge Mod Loader version 6.4.49.965
for Minecraft 1.6.4 loading
2014-12-09 16:20:49 [iNFO] [ForgeModLoader] Java is Java HotSpot 64-Bit Serv
er VM, version 1.8.0_20, running on Windows 8.1:amd64:6.3, installed at C:Progr
am FilesJavajre1.8.0_20
2014-12-09 16:20:49 [WARNING] [ForgeModLoader] The coremod codechicken.core.laun
ch.DepLoader does not have a MCVersion annotation, it may cause issues with this
 version of Minecraft
2014-12-09 16:20:49 [WARNING] [ForgeModLoader] The coremod appeng.transformer.Ap
pEngCore does not have a MCVersion annotation, it may cause issues with this ver
sion of Minecraft
2014-12-09 16:20:49 [iNFO] [ForgeModLoader] [AppEng] Core Init
2014-12-09 16:20:49 [WARNING] [ForgeModLoader] The coremod calclavia.lib.Calclav
iaPluginLoader does not have a MCVersion annotation, it may cause issues with th
is version of Minecraft
2014-12-09 16:20:49 [WARNING] [ForgeModLoader] The coremod codechicken.core.laun
ch.CodeChickenCorePlugin does not have a MCVersion annotation, it may cause issu
es with this version of Minecraft
2014-12-09 16:20:49 [iNFO] [sTDERR] Warning: version of ForgeMultipart-universal
-1.6.4-, 1.0.0.250 is newer than request 1.0.0.244
2014-12-09 16:20:49 [WARNING] [ForgeModLoader] The coremod cofh.asm.LoadingPlugi
n does not have a MCVersion annotation, it may cause issues with this version of
 Minecraft
2014-12-09 16:20:49 [WARNING] [ForgeModLoader] The coremod mods.immibis.microblo
cks.coremod.MicroblocksCoreMod does not have a MCVersion annotation, it may caus
e issues with this version of Minecraft
2014-12-09 16:20:49 [WARNING] [ForgeModLoader] The coremod invtweaks.forge.asm.F
MLPlugin does not have a MCVersion annotation, it may cause issues with this ver
sion of Minecraft
2014-12-09 16:20:49 [WARNING] [ForgeModLoader] The coremod logisticspipes.asm.Lo
gisticsPipesCoreLoader does not have a MCVersion annotation, it may cause issues
 with this version of Minecraft
2014-12-09 16:20:49 [WARNING] [ForgeModLoader] The coremod micdoodle8.mods.micco
re.MicdoodlePlugin does not have a MCVersion annotation, it may cause issues wit
h this version of Minecraft
2014-12-09 16:20:49 [WARNING] [ForgeModLoader] The coremod codechicken.nei.asm.N
EICorePlugin does not have a MCVersion annotation, it may cause issues with this
 version of Minecraft
2014-12-09 16:20:49 [WARNING] [ForgeModLoader] The coremod openmods.OpenModsCore
Plugin does not have a MCVersion annotation, it may cause issues with this versi
on of Minecraft
2014-12-09 16:20:49 [WARNING] [ForgeModLoader] The coremod codechicken.core.laun
ch.DepLoader does not have a MCVersion annotation, it may cause issues with this
 version of Minecraft
2014-12-09 16:20:49 [WARNING] [ForgeModLoader] The coremod mrtjp.projectred.comp
atibility.CompatibilityCorePlugin does not have a MCVersion annotation, it may c
ause issues with this version of Minecraft
2014-12-09 16:20:49 [WARNING] [ForgeModLoader] The coremod universalelectricity.
core.UELoader does not have a MCVersion annotation, it may cause issues with thi
s version of Minecraft
2014-12-09 16:20:49 [WARNING] [ForgeModLoader] The coremod codechicken.core.laun
ch.DepLoader does not have a MCVersion annotation, it may cause issues with this
 version of Minecraft
2014-12-09 16:20:49 [iNFO] [ForgeModLoader] Loading tweak class name cpw.mods.fm
l.common.launcher.FMLInjectionAndSortingTweaker
2014-12-09 16:20:49 [iNFO] [ForgeModLoader] Loading tweak class name cpw.mods.fm
l.common.launcher.FMLDeobfTweaker
2014-12-09 16:20:49 [iNFO] [ForgeModLoader] Calling tweak class cpw.mods.fml.com
mon.launcher.FMLInjectionAndSortingTweaker
2014-12-09 16:20:49 [sEVERE] [ForgeModLoader] Unable to launch
java.util.ConcurrentModificationException
        at java.util.ArrayList$Itr.checkForComodification(Unknown Source)
        at java.util.ArrayList$Itr.remove(Unknown Source)
        at net.minecraft.launchwrapper.Launch.launch(Launch.java:114)
        at net.minecraft.launchwrapper.Launch.main(Launch.java:27)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at cpw.mods.fml.relauncher.ServerLaunchWrapper.run(ServerLaunchWrapper.j
ava:48)
        at cpw.mods.fml.relauncher.ServerLaunchWrapper.main(ServerLaunchWrapper.
java:17)

C:UsersAnthonyDesktopServer>pause
Press any key to continue . . .

 

 

I have no idea how to fix this. I have tried re-installing the technic pack as well as resetting the pack. Anyone help?

Edited December 9, 2014 by ColonelEagleman

[Melfice]

1) Wrong section entirely. This is Off-Topic, where we don't talk about games. At all.

2) Issues like these go on the Tracker. You can find a link to it and its Rules and Guidelines in my signature.

3) Check the front page of www.technicpack.net. Search for "concurrentmodification" (without the quotationmarks).