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I want to play modded MC today. And I get crash. I have this:

Client> Sep 27, 2014 9:13:48 PM net.minecraft.launchwrapper.LogWrapper log
Client> INFO: Loading tweak class name cpw.mods.fml.common.launcher.FMLTweaker
Client> Sep 27, 2014 9:13:48 PM net.minecraft.launchwrapper.LogWrapper log
Client> INFO: Using primary tweak class name cpw.mods.fml.common.launcher.FMLTweaker
Client> Sep 27, 2014 9:13:48 PM net.minecraft.launchwrapper.LogWrapper log
Client> INFO: Calling tweak class cpw.mods.fml.common.launcher.FMLTweaker
Client> 2014-09-27 21:13:48 [INFO] [ForgeModLoader] Forge Mod Loader version 6.4.49.965 for Minecraft 1.6.4 loading
Client> 2014-09-27 21:13:48 [INFO] [ForgeModLoader] Java is Java HotSpot(TM) 64-Bit Server VM, version 1.8.0_20, running on Windows 8:amd64:6.2, installed at C:\Program Files\Java\jre1.8.0_20
Client> 2014-09-27 21:13:49 [WARNING] [ForgeModLoader] The coremod net.minecraftforge.lex.sortfix.CorePlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
Client> 2014-09-27 21:13:49 [WARNING] [ForgeModLoader] The coremod codechicken.core.launch.DepLoader does not have a MCVersion annotation, it may cause issues with this version of Minecraft
Client> 2014-09-27 21:13:49 [WARNING] [ForgeModLoader] The coremod worldcore.asm.WCFMLLoadingPlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
Client> 2014-09-27 21:13:49 [WARNING] [ForgeModLoader] The coremod com.spacechase0.minecraft.spacecore.asm.SpaceCorePlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
Client> 2014-09-27 21:13:49 [WARNING] [ForgeModLoader] The coremod appeng.transformer.AppEngCore does not have a MCVersion annotation, it may cause issues with this version of Minecraft
Client> 2014-09-27 21:13:49 [INFO] [ForgeModLoader] [AppEng] Core Init
Client> 2014-09-27 21:13:49 [WARNING] [ForgeModLoader] The coremod biomesoplenty.asm.BOPFMLLoadingPlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
Client> 2014-09-27 21:13:49 [INFO] [STDERR] Warning: version of CodeChickenLib-universal-1.6.4-, 1.0.0.62 is newer than request 1.0.0.61
Client> 2014-09-27 21:13:49 [WARNING] [ForgeModLoader] The coremod calclavia.lib.CalclaviaPluginLoader does not have a MCVersion annotation, it may cause issues with this version of Minecraft
Client> 2014-09-27 21:13:49 [WARNING] [ForgeModLoader] The coremod cofh.asm.LoadingPlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
Client> 2014-09-27 21:13:49 [WARNING] [ForgeModLoader] The coremod denoflionsx.denLib.CoreMod.denLibCore does not have a MCVersion annotation, it may cause issues with this version of Minecraft
Client> 2014-09-27 21:13:49 [WARNING] [ForgeModLoader] The coremod denoflionsx.DenPipes.Core.DenPipesCoreMod does not have a MCVersion annotation, it may cause issues with this version of Minecraft
Client> 2014-09-27 21:13:49 [WARNING] [ForgeModLoader] The coremod mcp.mobius.evoc.asm.CoreDescription does not have a MCVersion annotation, it may cause issues with this version of Minecraft
Client> 2014-09-27 21:13:49 [WARNING] [ForgeModLoader] The coremod ic2.core.coremod.IC2core does not have a MCVersion annotation, it may cause issues with this version of Minecraft
Client> 2014-09-27 21:13:49 [WARNING] [ForgeModLoader] The coremod invtweaks.forge.asm.FMLPlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
Client> 2014-09-27 21:13:49 [WARNING] [ForgeModLoader] The coremod logisticspipes.asm.LogisticsPipesCoreLoader does not have a MCVersion annotation, it may cause issues with this version of Minecraft
Client> 2014-09-27 21:13:49 [WARNING] [ForgeModLoader] The coremod mcp.mobius.mobiuscore.asm.CoreDescription does not have a MCVersion annotation, it may cause issues with this version of Minecraft
Client> 2014-09-27 21:13:49 [WARNING] [ForgeModLoader] The coremod codechicken.nei.asm.NEICorePlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
Client> 2014-09-27 21:13:49 [WARNING] [ForgeModLoader] The coremod openblocks.OpenBlocksCorePlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
Client> 2014-09-27 21:13:49 [WARNING] [ForgeModLoader] The coremod li.cil.oc.common.launch.TransformerLoader does not have a MCVersion annotation, it may cause issues with this version of Minecraft
Client> 2014-09-27 21:13:49 [WARNING] [ForgeModLoader] The coremod openmods.OpenModsCorePlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
Client> 2014-09-27 21:13:49 [WARNING] [ForgeModLoader] The coremod denoflionsx.PluginsforForestry.Core.CoreMod.PfFCoreMod does not have a MCVersion annotation, it may cause issues with this version of Minecraft
Client> 2014-09-27 21:13:49 [WARNING] [ForgeModLoader] The coremod codechicken.core.launch.DepLoader does not have a MCVersion annotation, it may cause issues with this version of Minecraft
Client> 2014-09-27 21:13:49 [WARNING] [ForgeModLoader] The coremod mrtjp.projectred.compatibility.CompatibilityCorePlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
Client> 2014-09-27 21:13:49 [WARNING] [ForgeModLoader] The coremod tconstruct.preloader.TConstructLoaderContainer does not have a MCVersion annotation, it may cause issues with this version of Minecraft
Client> 2014-09-27 21:13:49 [INFO] [TCon-Preloader] Scalpel. Suction. Lumber axe. CLEAR! *zap*
Client> 2014-09-27 21:13:49 [INFO] [TCon-Preloader] Constructing preloader (Modules: [tconstruct.preloader.AccessTransformers, tconstruct.preloader.ASMInterfaceRepair])
Client> 2014-09-27 21:13:49 [INFO] [TCon-Preloader] Found a properties file. Attempting load...
Client> 2014-09-27 21:13:49 [INFO] [TCon-Preloader] Loaded properties successfully. Using specified settings.
Client> 2014-09-27 21:13:49 [WARNING] [ForgeModLoader] The coremod codechicken.core.launch.DepLoader does not have a MCVersion annotation, it may cause issues with this version of Minecraft
Client> 2014-09-27 21:13:49 [INFO] [ForgeModLoader] Loading tweak class name cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker
Client> 2014-09-27 21:13:49 [INFO] [ForgeModLoader] Loading tweak class name cpw.mods.fml.common.launcher.FMLDeobfTweaker
Client> 2014-09-27 21:13:49 [INFO] [ForgeModLoader] Calling tweak class cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker
Client> 2014-09-27 21:13:49 [SEVERE] [ForgeModLoader] Unable to launch
Client> java.util.ConcurrentModificationException
Client> at java.util.ArrayList$Itr.checkForComodification(Unknown Source)
Client> at java.util.ArrayList$Itr.remove(Unknown Source)
Client> at net.minecraft.launchwrapper.Launch.launch(Launch.java:114)
Client> at net.minecraft.launchwrapper.Launch.main(Launch.java:27)
Client> Java HotSpot(TM) 64-Bit Server VM warning: ignoring option MaxPermSize=512m; support was removed in 8.0
Client> Picked up _JAVA_OPTIONS: -Xmx512M
Game ended with no troubles detected (exit code 0)
Deleting C:\Users\GT683R\AppData\Roaming\.minecraft\versions\1.6.4-Forge9.11.1.965\1.6.4-Forge9.11.1.965-natives-7488162240717

I just can play on weekend so I don't have much time. I just want to play for 2 days. If you can help me, I'll be happy. Thanks.

Thanks you very much grimallq. I deleted Java 8 and installed Java 7. Then it works. Thanks again.