I'm trying to load minecraft with forge installed version 1.6.4 with about 100 mods(mod pack). i have tried everything i know and so has the guy who created the mod pack(family). i have uninstalled and re-installed forge, recreated the .minecraft, and updated my drivers. when i hit play, with 1.6.4 forge, it says loading and then crashes and doesn't load. it doesn't launch whatsoever. if i switch it to vanilla 1.8, it runs fine. i don't know what else to do. please help.

 

 

heres the log:

INFO: Loading tweak class name cpw.mods.fml.common.launcher.FMLTweaker

Jan 02, 2015 9:17:01 PM net.minecraft.launchwrapper.LogWrapper log

INFO: Using primary tweak class name cpw.mods.fml.common.launcher.FMLTweaker

Jan 02, 2015 9:17:01 PM net.minecraft.launchwrapper.LogWrapper log

INFO: Calling tweak class cpw.mods.fml.common.launcher.FMLTweaker

2015-01-02 21:17:01 [iNFO] [ForgeModLoader] Forge Mod Loader version 6.4.49.965 for Minecraft 1.6.4 loading

2015-01-02 21:17:01 [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 Files (x86)\Minecraft\runtime\jre-x64\1.8.0_25

2015-01-02 21:17:02 [WARNING] [ForgeModLoader] The coremod codechicken.core.launch.DepLoader does not have a MCVersion annotation, it may cause issues with this version of Minecraft

2015-01-02 21:17:02 [WARNING] [ForgeModLoader] The coremod worldcore.asm.WCFMLLoadingPlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft

2015-01-02 21:17:02 [WARNING] [ForgeModLoader] The coremod appeng.transformer.AppEngCore does not have a MCVersion annotation, it may cause issues with this version of Minecraft

2015-01-02 21:17:03 [iNFO] [ForgeModLoader] [AppEng] Core Init

2015-01-02 21:17:03 [WARNING] [ForgeModLoader] The coremod biomesoplenty.asm.BOPFMLLoadingPlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft

2015-01-02 21:17:05 [WARNING] [ForgeModLoader] The coremod codechicken.core.launch.CodeChickenCorePlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft

2015-01-02 21:17:05 [WARNING] [ForgeModLoader] The coremod ic2.core.coremod.IC2core does not have a MCVersion annotation, it may cause issues with this version of Minecraft

2015-01-02 21:17:05 [WARNING] [ForgeModLoader] The coremod invtweaks.forge.asm.FMLPlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft

2015-01-02 21:17:05 [WARNING] [ForgeModLoader] The coremod codechicken.nei.asm.NEICorePlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft

2015-01-02 21:17:06 [WARNING] [ForgeModLoader] The coremod resonant.core.ResonantPluginLoader does not have a MCVersion annotation, it may cause issues with this version of Minecraft

2015-01-02 21:17:06 [WARNING] [ForgeModLoader] The coremod tconstruct.preloader.TConstructLoaderContainer does not have a MCVersion annotation, it may cause issues with this version of Minecraft

2015-01-02 21:17:06 [iNFO] [TCon-Preloader] Scalpel. Suction. Lumber axe. CLEAR! *zap*

2015-01-02 21:17:06 [iNFO] [TCon-Preloader] Constructing preloader (Modules: [tconstruct.preloader.AccessTransformers, tconstruct.preloader.ASMInterfaceRepair])

2015-01-02 21:17:06 [iNFO] [TCon-Preloader] Found a properties file. Attempting load...

2015-01-02 21:17:06 [iNFO] [TCon-Preloader] Loaded properties successfully. Using specified settings.

2015-01-02 21:17:06 [WARNING] [ForgeModLoader] The coremod universalelectricity.core.UELoader does not have a MCVersion annotation, it may cause issues with this version of Minecraft

2015-01-02 21:17:06 [iNFO] [ForgeModLoader] Loading tweak class name cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker

2015-01-02 21:17:06 [iNFO] [ForgeModLoader] Loading tweak class name cpw.mods.fml.common.launcher.FMLDeobfTweaker

2015-01-02 21:17:06 [iNFO] [ForgeModLoader] Calling tweak class cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker

2015-01-02 21:17:07 [sEVERE] [ForgeModLoader] Unable to launch

java.util.ConcurrentModificationException

at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:901)

at java.util.ArrayList$Itr.remove(ArrayList.java:865)

at net.minecraft.launchwrapper.Launch.launch(Launch.java:114)

at net.minecraft.launchwrapper.Launch.main(Launch.java:27)

Java HotSpot 64-Bit Server VM warning: Using incremental CMS is deprecated and will likely be removed in a future release

Read the EAQ, that's all the help you'll get.