Modpack error

[az4521]

ok, so my modpack should run fine, i have no errors except for one, and it seems java related. i know the block id's dont conflict (thanks ftb configs) but it's just this error.

[b#439]  2014-11-21 17:07:43 [sEVERE] [ForgeModLoader] Unable to launch

[b#439]  java.util.ConcurrentModificationException

[b#439]   at java.util.ArrayList$Itr.checkForComodification(Unknown Source)

[b#439]   at java.util.ArrayList$Itr.remove(Unknown Source)

[b#439]   at net.minecraft.launchwrapper.Launch.launch(Launch.java:114)

[b#439]   at net.minecraft.launchwrapper.Launch.main(Launch.java:27)

[b#439] Analytics Response [runModpack]: 200

[b#439]  Nov 21, 2014 5:07:44 PM net.minecraft.launchwrapper.LogWrapper log

[b#439]  INFO: Loading tweak class name cpw.mods.fml.common.launcher.FMLTweaker

[b#439]  Nov 21, 2014 5:07:44 PM net.minecraft.launchwrapper.LogWrapper log

[b#439]  INFO: Using primary tweak class name cpw.mods.fml.common.launcher.FMLTweaker

[b#439]  Nov 21, 2014 5:07:44 PM net.minecraft.launchwrapper.LogWrapper log

[b#439]  INFO: Calling tweak class cpw.mods.fml.common.launcher.FMLTweaker

[b#439]  2014-11-21 17:07:44 [iNFO] [ForgeModLoader] Forge Mod Loader version 6.4.49.965 for Minecraft 1.6.4 loading

[b#439]  2014-11-21 17:07:44 [iNFO] [ForgeModLoader] Java is Java HotSpot 64-Bit Server VM, version 1.8.0_25, running on Windows 8.1:amd64:6.3, installed at C:Program FilesJavajre1.8.0_25

[b#439]  2014-11-21 17:07:44 [WARNING] [ForgeModLoader] The coremod codechicken.core.launch.DepLoader does not have a MCVersion annotation, it may cause issues with this version of Minecraft

[b#439]  2014-11-21 17:07:44 [WARNING] [ForgeModLoader] The coremod appeng.transformer.AppEngCore does not have a MCVersion annotation, it may cause issues with this version of Minecraft

[b#439]  2014-11-21 17:07:44 [iNFO] [ForgeModLoader] [AppEng] Core Init

[b#439]  2014-11-21 17:07:44 [WARNING] [ForgeModLoader] The coremod codechicken.core.launch.CodeChickenCorePlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft

[b#439]  Java HotSpot 64-Bit Server VM warning: ignoring option MaxPermSize=256m; support was removed in 8.0

[b#439]  2014-11-21 17:07:44 [WARNING] [ForgeModLoader] The coremod cofh.asm.LoadingPlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft

[b#439]  2014-11-21 17:07:44 [WARNING] [ForgeModLoader] The coremod mcp.mobius.evoc.asm.CoreDescription does not have a MCVersion annotation, it may cause issues with this version of Minecraft

[b#439]  2014-11-21 17:07:44 [WARNING] [ForgeModLoader] The coremod ic2.core.coremod.IC2core does not have a MCVersion annotation, it may cause issues with this version of Minecraft

[b#439]  2014-11-21 17:07:44 [WARNING] [ForgeModLoader] The coremod logisticspipes.asm.LogisticsPipesCoreLoader does not have a MCVersion annotation, it may cause issues with this version of Minecraft

[b#439]  2014-11-21 17:07:44 [WARNING] [ForgeModLoader] The coremod mekanism.common.asm.LoadingHook does not have a MCVersion annotation, it may cause issues with this version of Minecraft

[b#439]  2014-11-21 17:07:44 [WARNING] [ForgeModLoader] The coremod micdoodle8.mods.miccore.MicdoodlePlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft

[b#439]  2014-11-21 17:07:44 [WARNING] [ForgeModLoader] The coremod codechicken.nei.asm.NEICorePlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft

[b#439]  2014-11-21 17:07:44 [WARNING] [ForgeModLoader] The coremod openblocks.OpenBlocksCorePlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft

[b#439]  2014-11-21 17:07:44 [WARNING] [ForgeModLoader] The coremod openmods.OpenModsCorePlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft

[b#439]  2014-11-21 17:07:44 [WARNING] [ForgeModLoader] The coremod codechicken.core.launch.DepLoader does not have a MCVersion annotation, it may cause issues with this version of Minecraft

[b#439]  2014-11-21 17:07:44 [WARNING] [ForgeModLoader] The coremod mrtjp.projectred.compatibility.CompatibilityCorePlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft

[b#439]  2014-11-21 17:07:44 [WARNING] [ForgeModLoader] The coremod tconstruct.preloader.TConstructLoaderContainer does not have a MCVersion annotation, it may cause issues with this version of Minecraft

[b#439]  2014-11-21 17:07:44 [iNFO] [TCon-Preloader] Scalpel. Suction. Lumber axe. CLEAR! *zap*

[b#439]  2014-11-21 17:07:44 [iNFO] [TCon-Preloader] Constructing preloader (Modules: [tconstruct.preloader.AccessTransformers, tconstruct.preloader.ASMInterfaceRepair])

[b#439]  2014-11-21 17:07:44 [iNFO] [TCon-Preloader] Found a properties file. Attempting load...

[b#439]  2014-11-21 17:07:44 [iNFO] [TCon-Preloader] Loaded properties successfully. Using specified settings.

[b#439]  2014-11-21 17:07:44 [WARNING] [ForgeModLoader] The coremod codechicken.core.launch.DepLoader does not have a MCVersion annotation, it may cause issues with this version of Minecraft

[b#439]  2014-11-21 17:07:44 [iNFO] [ForgeModLoader] Loading tweak class name cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker

[b#439]  2014-11-21 17:07:44 [iNFO] [ForgeModLoader] Loading tweak class name cpw.mods.fml.common.launcher.FMLDeobfTweaker

[b#439]  2014-11-21 17:07:44 [iNFO] [ForgeModLoader] Calling tweak class cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker

[b#439]  2014-11-21 17:07:44 [sEVERE] [ForgeModLoader] Unable to launch

[b#439]  java.util.ConcurrentModificationException

[b#439]   at java.util.ArrayList$Itr.checkForComodification(Unknown Source)

[b#439]   at java.util.ArrayList$Itr.remove(Unknown Source)

[b#439]   at net.minecraft.launchwrapper.Launch.launch(Launch.java:114)

[b#439]   at net.minecraft.launchwrapper.Launch.main(Launch.java:27)

[b#439]  Java HotSpot 64-Bit Server VM warning: ignoring option MaxPermSize=256m; support was removed in 8.0

 

that's what keeps crashing it. nothing else returns [severe]

this is with minecraft 1.6.4 and i have both java 7 and 8, but 8 is disabled,

EDIT: nevermind. it WAS java 8 causing the problem... 

Edited November 21, 2014 by az4521