Hi, just a few days ago my friend and I started playing this mod. Everything was going fine. Then, one day, the mod stoped launching. Normal minecraft will launch, but the mod will not. here is the log: 2014-08-24 12:54:38 [iNFO] [ForgeModLoader] Forge Mod Loader version 6.4.49.965 for Minecraft 1.6.4 loading2014-08-24 12:54:38 [iNFO] [ForgeModLoader] Java is Java HotSpot 64-Bit Server VM, version 1.8.0_20, running on Windows 8:amd64:6.2, installed at C:Program FilesJavajre1.8.0_202014-08-24 12:54:38 [FINE] [ForgeModLoader] Java classpath at launch is C:UsersJoshAppDataRoaming.minecraftlibrariesnetminecraftforgeminecraftforge9.11.1.965minecraftforge-9.11.1.965.jar;C:UsersJoshAppDataRoaming.minecraftlibrariesnetminecraftlaunchwrapper1.8launchwrapper-1.8.jar;C:UsersJoshAppDataRoaming.minecraftlibrariesorgow2asmasm-all4.1asm-all-4.1.jar;C:UsersJoshAppDataRoaming.minecraftlibrariesorgscala-langscala-library2.10.2scala-library-2.10.2.jar;C:UsersJoshAppDataRoaming.minecraftlibrariesorgscala-langscala-compiler2.10.2scala-compiler-2.10.2.jar;C:UsersJoshAppDataRoaming.minecraftlibrarieslzmalzma0.0.1lzma-0.0.1.jar;C:UsersJoshAppDataRoaming.minecraftlibrariesnetsfjopt-simplejopt-simple4.5jopt-simple-4.5.jar;C:UsersJoshAppDataRoaming.minecraftlibrariescompaulscodecodecjorbis20101023codecjorbis-20101023.jar;C:UsersJoshAppDataRoaming.minecraftlibrariescompaulscodecodecwav20101023codecwav-20101023.jar;C:UsersJoshAppDataRoaming.minecraftlibrariescompaulscodelibraryjavasound20101123libraryjavasound-20101123.jar;C:UsersJoshAppDataRoaming.minecraftlibrariescompaulscodelibrarylwjglopenal20100824librarylwjglopenal-20100824.jar;C:UsersJoshAppDataRoaming.minecraftlibrariescompaulscodesoundsystem20120107soundsystem-20120107.jar;C:UsersJoshAppDataRoaming.minecraftlibrariesargoargo2.25_fixedargo-2.25_fixed.jar;C:UsersJoshAppDataRoaming.minecraftlibrariesorgbouncycastlebcprov-jdk15on1.47bcprov-jdk15on-1.47.jar;C:UsersJoshAppDataRoaming.minecraftlibrariescomgoogleguavaguava14.0guava-14.0.jar;C:UsersJoshAppDataRoaming.minecraftlibrariesorgapachecommonscommons-lang33.1commons-lang3-3.1.jar;C:UsersJoshAppDataRoaming.minecraftlibrariescommons-iocommons-io2.4commons-io-2.4.jar;C:UsersJoshAppDataRoaming.minecraftlibrariesnetjavajinputjinput2.0.5jinput-2.0.5.jar;C:UsersJoshAppDataRoaming.minecraftlibrariesnetjavajutilsjutils1.0.0jutils-1.0.0.jar;C:UsersJoshAppDataRoaming.minecraftlibrariescomgooglecodegsongson2.2.2gson-2.2.2.jar;C:UsersJoshAppDataRoaming.minecraftlibrariesorglwjgllwjgllwjgl2.9.0lwjgl-2.9.0.jar;C:UsersJoshAppDataRoaming.minecraftlibrariesorglwjgllwjgllwjgl_util2.9.0lwjgl_util-2.9.0.jar;C:UsersJoshAppDataRoaming.minecraftversions1.6.4-Forge9.11.1.9651.6.4-Forge9.11.1.965.jar2014-08-24 12:54:38 [FINE] [ForgeModLoader] Java library path at launch is C:UsersJoshAppDataRoaming.minecraftversions1.6.4-Forge9.11.1.9651.6.4-Forge9.11.1.965-natives-1843663504776462014-08-24 12:54:38 [FINE] [ForgeModLoader] Enabling runtime deobfuscation2014-08-24 12:54:38 [FINE] [ForgeModLoader] Instantiating coremod class FMLCorePlugin2014-08-24 12:54:38 [FINE] [ForgeModLoader] Enqueued coremod FMLCorePlugin2014-08-24 12:54:38 [FINE] [ForgeModLoader] Instantiating coremod class FMLForgePlugin2014-08-24 12:54:38 [FINE] [ForgeModLoader] Enqueued coremod FMLForgePlugin2014-08-24 12:54:38 [FINE] [ForgeModLoader] All fundamental core mods are successfully located2014-08-24 12:54:38 [FINE] [ForgeModLoader] Discovering coremods2014-08-24 12:54:38 [FINE] [ForgeModLoader] Examining for coremod candidacy TFC-0.78.17.jar2014-08-24 12:54:38 [FINEST] [ForgeModLoader] Found FMLCorePluginContainsFMLMod marker in TFC-0.78.17.jar, it will be examined later for regular @Mod instances2014-08-24 12:54:38 [FINE] [ForgeModLoader] Instantiating coremod class TFCASMLoadingPlugin2014-08-24 12:54:38 [WARNING] [ForgeModLoader] The coremod TFC.TFCASMLoadingPlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft2014-08-24 12:54:38 [FINE] [ForgeModLoader] Enqueued coremod TFCASMLoadingPlugin2014-08-24 12:54:38 [iNFO] [ForgeModLoader] Loading tweak class name cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker2014-08-24 12:54:38 [iNFO] [ForgeModLoader] Loading tweak class name cpw.mods.fml.common.launcher.FMLDeobfTweaker2014-08-24 12:54:38 [iNFO] [ForgeModLoader] Calling tweak class cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker2014-08-24 12:54:38 [sEVERE] [ForgeModLoader] Unable to launchjava.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) The only changes that happened to my laptop between it working and not working is there was a java update, and I had to force-close the mod while my computer was locking up on me. Any help would be appreciated! thanks