i have this error log
2014-08-31 16:34:09 [INFO] [ForgeModLoader] Forge Mod Loader version 6.4.49.965 for Minecraft 1.6.4 loading
2014-08-31 16:34:09 [INFO] [ForgeModLoader] Java is Java HotSpot(TM) 64-Bit Server VM, version 1.8.0_20, running on Windows 7:amd64:6.1, installed at C:\Program Files\Java\jre1.8.0_20
2014-08-31 16:34:09 [FINE] [ForgeModLoader] Java classpath at launch is C:\Users\Jay-Michael\AppData\Roaming\.minecraft\libraries\net\minecraftforge\minecraftforge\9.11.1.965\minecraftforge-9.11.1.965.jar;C:\Users\Jay-Michael\AppData\Roaming\.minecraft\libraries\net\minecraft\launchwrapper\1.8\launchwrapper-1.8.jar;C:\Users\Jay-Michael\AppData\Roaming\.minecraft\libraries\org\ow2\asm\asm-all\4.1\asm-all-4.1.jar;C:\Users\Jay-Michael\AppData\Roaming\.minecraft\libraries\org\scala-lang\scala-library\2.10.2\scala-library-2.10.2.jar;C:\Users\Jay-Michael\AppData\Roaming\.minecraft\libraries\org\scala-lang\scala-compiler\2.10.2\scala-compiler-2.10.2.jar;C:\Users\Jay-Michael\AppData\Roaming\.minecraft\libraries\lzma\lzma\0.0.1\lzma-0.0.1.jar;C:\Users\Jay-Michael\AppData\Roaming\.minecraft\libraries\net\sf\jopt-simple\jopt-simple\4.5\jopt-simple-4.5.jar;C:\Users\Jay-Michael\AppData\Roaming\.minecraft\libraries\com\paulscode\codecjorbis\20101023\codecjorbis-20101023.jar;C:\Users\Jay-Michael\AppData\Roaming\.minecraft\libraries\com\paulscode\codecwav\20101023\codecwav-20101023.jar;C:\Users\Jay-Michael\AppData\Roaming\.minecraft\libraries\com\paulscode\libraryjavasound\20101123\libraryjavasound-20101123.jar;C:\Users\Jay-Michael\AppData\Roaming\.minecraft\libraries\com\paulscode\librarylwjglopenal\20100824\librarylwjglopenal-20100824.jar;C:\Users\Jay-Michael\AppData\Roaming\.minecraft\libraries\com\paulscode\soundsystem\20120107\soundsystem-20120107.jar;C:\Users\Jay-Michael\AppData\Roaming\.minecraft\libraries\argo\argo\2.25_fixed\argo-2.25_fixed.jar;C:\Users\Jay-Michael\AppData\Roaming\.minecraft\libraries\org\bouncycastle\bcprov-jdk15on\1.47\bcprov-jdk15on-1.47.jar;C:\Users\Jay-Michael\AppData\Roaming\.minecraft\libraries\com\google\guava\guava\14.0\guava-14.0.jar;C:\Users\Jay-Michael\AppData\Roaming\.minecraft\libraries\org\apache\commons\commons-lang3\3.1\commons-lang3-3.1.jar;C:\Users\Jay-Michael\AppData\Roaming\.minecraft\libraries\commons-io\commons-io\2.4\commons-io-2.4.jar;C:\Users\Jay-Michael\AppData\Roaming\.minecraft\libraries\net\java\jinput\jinput\2.0.5\jinput-2.0.5.jar;C:\Users\Jay-Michael\AppData\Roaming\.minecraft\libraries\net\java\jutils\jutils\1.0.0\jutils-1.0.0.jar;C:\Users\Jay-Michael\AppData\Roaming\.minecraft\libraries\com\google\code\gson\gson\2.2.2\gson-2.2.2.jar;C:\Users\Jay-Michael\AppData\Roaming\.minecraft\libraries\org\lwjgl\lwjgl\lwjgl\2.9.0\lwjgl-2.9.0.jar;C:\Users\Jay-Michael\AppData\Roaming\.minecraft\libraries\org\lwjgl\lwjgl\lwjgl_util\2.9.0\lwjgl_util-2.9.0.jar;C:\Users\Jay-Michael\AppData\Roaming\.minecraft\versions\1.6.4-Forge9.11.1.965\1.6.4-Forge9.11.1.965.jar
2014-08-31 16:34:09 [FINE] [ForgeModLoader] Java library path at launch is C:\Users\Jay-Michael\AppData\Roaming\.minecraft\versions\1.6.4-Forge9.11.1.965\1.6.4-Forge9.11.1.965-natives-48099313575124
2014-08-31 16:34:09 [FINE] [ForgeModLoader] Enabling runtime deobfuscation
2014-08-31 16:34:09 [FINE] [ForgeModLoader] Instantiating coremod class FMLCorePlugin
2014-08-31 16:34:09 [FINE] [ForgeModLoader] Enqueued coremod FMLCorePlugin
2014-08-31 16:34:09 [FINE] [ForgeModLoader] Instantiating coremod class FMLForgePlugin
2014-08-31 16:34:09 [FINE] [ForgeModLoader] Enqueued coremod FMLForgePlugin
2014-08-31 16:34:09 [FINE] [ForgeModLoader] All fundamental core mods are successfully located
2014-08-31 16:34:09 [FINE] [ForgeModLoader] Discovering coremods
2014-08-31 16:34:09 [FINE] [ForgeModLoader] Examining for coremod candidacy TooManyItems2013_09_24_1.6.4_Forge.jar
2014-08-31 16:34:09 [FINEST] [ForgeModLoader] Adding TooManyItems2013_09_24_1.6.4_Forge.jar to the list of known coremods, it will not be examined again
2014-08-31 16:34:09 [FINE] [ForgeModLoader] Instantiating coremod class TMIForgeLoader
2014-08-31 16:34:09 [FINE] [ForgeModLoader] The coremod TMIForgeLoader requested minecraft version 1.6.4 and minecraft is 1.6.4. It will be loaded.
2014-08-31 16:34:09 [FINE] [ForgeModLoader] Enqueued coremod TMIForgeLoader
2014-08-31 16:34:09 [INFO] [ForgeModLoader] Loading tweak class name cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker
2014-08-31 16:34:09 [INFO] [ForgeModLoader] Loading tweak class name cpw.mods.fml.common.launcher.FMLDeobfTweaker
2014-08-31 16:34:09 [INFO] [ForgeModLoader] Calling tweak class cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker
2014-08-31 16:34:09 [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)

and it wont lt me see start my minecraft forge and i have the latest java version