I encounter this same permgen error when launching any modpack with ATLauncher. I have reinstalled the modpacks, reinstalled Java, and increased permgen under Settings "Java/Mincraft" without luck. I could not find any fixes searching these forums or google. Following is my ATLauncher console log. Thanks for any help.
[28/12/2014 20:09:05 PM] Console Cleared
[28/12/2014 20:09:12 PM] Checking Access Token!
[28/12/2014 20:09:13 PM] Access token checked and is valid!
[28/12/2014 20:09:13 PM] Refreshing Access Token!
[28/12/2014 20:09:13 PM] Launching Minecraft with the following arguments (user related stuff has been removed): [C:\Program Files\Java\jre1.8.0_25\bin\javaw, -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump, -XX:-OmitStackTraceInFastThrow, -XX:+UseConcMarkSweepGC, -XX:+CMSIncrementalMode, -XX:-UseAdaptiveSizePolicy, -Xms256M, -Xmx1024M, -XX:MetaspaceSize=256M, -Duser.language=en, -Duser.country=US, -Dfml.log.level=INFO, -Djava.library.path=**USERSDIR**\Instances\SkyFactory\bin\natives, -cp, **USERSDIR**\ATLauncher.exe;anything;**USERSDIR**\Instances\SkyFactory\jarmods\forge-1.6.4-9.11.1.965-universal.jar;**USERSDIR**\Instances\SkyFactory\bin\launchwrapper-1.8.jar;**USERSDIR**\Instances\SkyFactory\bin\asm-all-4.1.jar;**USERSDIR**\Instances\SkyFactory\bin\scala-library-2.10.2.jar;**USERSDIR**\Instances\SkyFactory\bin\scala-compiler-2.10.2.jar;**USERSDIR**\Instances\SkyFactory\bin\lzma-0.0.1.jar;**USERSDIR**\Instances\SkyFactory\bin\jopt-simple-4.5.jar;**USERSDIR**\Instances\SkyFactory\bin\codecjorbis-20101023.jar;**USERSDIR**\Instances\SkyFactory\bin\codecwav-20101023.jar;**USERSDIR**\Instances\SkyFactory\bin\libraryjavasound-20101123.jar;**USERSDIR**\Instances\SkyFactory\bin\librarylwjglopenal-20100824.jar;**USERSDIR**\Instances\SkyFactory\bin\soundsystem-20120107.jar;**USERSDIR**\Instances\SkyFactory\bin\argo-2.25_fixed.jar;**USERSDIR**\Instances\SkyFactory\bin\bcprov-jdk15on-1.47.jar;**USERSDIR**\Instances\SkyFactory\bin\guava-14.0.jar;**USERSDIR**\Instances\SkyFactory\bin\commons-lang3-3.1.jar;**USERSDIR**\Instances\SkyFactory\bin\commons-io-2.4.jar;**USERSDIR**\Instances\SkyFactory\bin\jinput-2.0.5.jar;**USERSDIR**\Instances\SkyFactory\bin\jutils-1.0.0.jar;**USERSDIR**\Instances\SkyFactory\bin\gson-2.2.2.jar;**USERSDIR**\Instances\SkyFactory\bin\lwjgl-2.9.0.jar;**USERSDIR**\Instances\SkyFactory\bin\lwjgl_util-2.9.0.jar;**USERSDIR**\Instances\SkyFactory\bin\minecraft.jar, net.minecraft.launchwrapper.Launch, --username, REDACTED, --session, token:REDACTED:REDACTED, --version, 1.6.4, --gameDir, **USERSDIR**\Instances\SkyFactory, --assetsDir, **USERSDIR**\Configs\Resources\virtual\legacy, --width=1600, --height=900, --tweakClass=cpw.mods.fml.common.launcher.FMLTweaker]
[28/12/2014 20:09:14 PM] Dec 28, 2014 8:09:13 PM net.minecraft.launchwrapper.LogWrapper log
[28/12/2014 20:09:14 PM] INFO: Loading tweak class name cpw.mods.fml.common.launcher.FMLTweaker
[28/12/2014 20:09:14 PM] Dec 28, 2014 8:09:14 PM net.minecraft.launchwrapper.LogWrapper log
[28/12/2014 20:09:14 PM] INFO: Using primary tweak class name cpw.mods.fml.common.launcher.FMLTweaker
[28/12/2014 20:09:14 PM] Dec 28, 2014 8:09:14 PM net.minecraft.launchwrapper.LogWrapper log
[28/12/2014 20:09:14 PM] INFO: Calling tweak class cpw.mods.fml.common.launcher.FMLTweaker
[28/12/2014 20:09:14 PM] [INFO] [ForgeModLoader] Forge Mod Loader version 6.4.49.965 for Minecraft 1.6.4 loading
[28/12/2014 20:09:14 PM] [INFO] [ForgeModLoader] Java is Java HotSpot(TM) 64-Bit Server VM, version 1.8.0_25, running on Windows 8.1:amd64:6.3, installed at C:\Program Files\Java\jre1.8.0_25
[28/12/2014 20:09:14 PM] [WARNING] [ForgeModLoader] The coremod codechicken.core.launch.DepLoader does not have a MCVersion annotation, it may cause issues with this version of Minecraft
[28/12/2014 20:09:14 PM] [WARNING] [ForgeModLoader] The coremod appeng.transformer.AppEngCore does not have a MCVersion annotation, it may cause issues with this version of Minecraft
[28/12/2014 20:09:14 PM] [INFO] [ForgeModLoader] [AppEng] Core Init
[28/12/2014 20:09:14 PM] [WARNING] [ForgeModLoader] The coremod codechicken.core.launch.CodeChickenCorePlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
[28/12/2014 20:09:15 PM] [WARNING] [ForgeModLoader] The coremod cofh.asm.LoadingPlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
[28/12/2014 20:09:15 PM] [WARNING] [ForgeModLoader] The coremod invtweaks.forge.asm.FMLPlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
[28/12/2014 20:09:15 PM] [WARNING] [ForgeModLoader] The coremod mcp.mobius.mobiuscore.asm.CoreDescription does not have a MCVersion annotation, it may cause issues with this version of Minecraft
[28/12/2014 20:09:15 PM] [WARNING] [ForgeModLoader] The coremod codechicken.nei.asm.NEICorePlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
[28/12/2014 20:09:15 PM] [WARNING] [ForgeModLoader] The coremod openblocks.OpenBlocksCorePlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
[28/12/2014 20:09:15 PM] [WARNING] [ForgeModLoader] The coremod openeye.CorePlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
[28/12/2014 20:09:15 PM] [WARNING] [ForgeModLoader] The coremod openmods.OpenModsCorePlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
[28/12/2014 20:09:15 PM] [WARNING] [ForgeModLoader] The coremod tconstruct.preloader.TConstructLoaderContainer does not have a MCVersion annotation, it may cause issues with this version of Minecraft
[28/12/2014 20:09:15 PM] [INFO] [TCon-Preloader] Scalpel. Suction. Lumber axe. CLEAR! *zap*
[28/12/2014 20:09:15 PM] [INFO] [TCon-Preloader] Constructing preloader (Modules: [tconstruct.preloader.AccessTransformers, tconstruct.preloader.ASMInterfaceRepair])
[28/12/2014 20:09:15 PM] [INFO] [TCon-Preloader] Found a properties file. Attempting load...
[28/12/2014 20:09:15 PM] [INFO] [TCon-Preloader] Loaded properties successfully. Using specified settings.
[28/12/2014 20:09:15 PM] [WARNING] [ForgeModLoader] The coremod portablejim.veinminer.asm.VeinMinerCorePlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
[28/12/2014 20:09:15 PM] [INFO] [ForgeModLoader] Loading tweak class name cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker
[28/12/2014 20:09:15 PM] [INFO] [ForgeModLoader] Loading tweak class name cpw.mods.fml.common.launcher.FMLDeobfTweaker
[28/12/2014 20:09:16 PM] [INFO] [ForgeModLoader] Calling tweak class cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker
[28/12/2014 20:09:16 PM] [SEVERE] [ForgeModLoader] Unable to launch
[28/12/2014 20:09:16 PM] java.util.ConcurrentModificationException
[28/12/2014 20:09:16 PM] at java.util.ArrayList$Itr.checkForComodification(Unknown Source)
[28/12/2014 20:09:16 PM] at java.util.ArrayList$Itr.remove(Unknown Source)
[28/12/2014 20:09:16 PM] at net.minecraft.launchwrapper.Launch.launch(Launch.java:114)
[28/12/2014 20:09:16 PM] at net.minecraft.launchwrapper.Launch.main(Launch.java:27)
[28/12/2014 20:09:16 PM] Java HotSpot(TM) 64-Bit Server VM warning: Using incremental CMS is deprecated and will likely be removed in a future release
[28/12/2014 20:09:16 PM] Checking for updated files!
[28/12/2014 20:09:17 PM] No updates found!
[28/12/2014 20:09:22 PM] Copied Log to clipboard
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I encounter this same permgen error when launching any modpack with ATLauncher. I have reinstalled the modpacks, reinstalled Java, and increased permgen under Settings "Java/Mincraft" without luck. I could not find any fixes searching these forums or google. Following is my ATLauncher console log. Thanks for any help.
[28/12/2014 20:09:05 PM] Console Cleared
[28/12/2014 20:09:12 PM] Checking Access Token!
[28/12/2014 20:09:13 PM] Access token checked and is valid!
[28/12/2014 20:09:13 PM] Refreshing Access Token!
[28/12/2014 20:09:13 PM] Launching Minecraft with the following arguments (user related stuff has been removed): [C:\Program Files\Java\jre1.8.0_25\bin\javaw, -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump, -XX:-OmitStackTraceInFastThrow, -XX:+UseConcMarkSweepGC, -XX:+CMSIncrementalMode, -XX:-UseAdaptiveSizePolicy, -Xms256M, -Xmx1024M, -XX:MetaspaceSize=256M, -Duser.language=en, -Duser.country=US, -Dfml.log.level=INFO, -Djava.library.path=**USERSDIR**\Instances\SkyFactory\bin\natives, -cp, **USERSDIR**\ATLauncher.exe;anything;**USERSDIR**\Instances\SkyFactory\jarmods\forge-1.6.4-9.11.1.965-universal.jar;**USERSDIR**\Instances\SkyFactory\bin\launchwrapper-1.8.jar;**USERSDIR**\Instances\SkyFactory\bin\asm-all-4.1.jar;**USERSDIR**\Instances\SkyFactory\bin\scala-library-2.10.2.jar;**USERSDIR**\Instances\SkyFactory\bin\scala-compiler-2.10.2.jar;**USERSDIR**\Instances\SkyFactory\bin\lzma-0.0.1.jar;**USERSDIR**\Instances\SkyFactory\bin\jopt-simple-4.5.jar;**USERSDIR**\Instances\SkyFactory\bin\codecjorbis-20101023.jar;**USERSDIR**\Instances\SkyFactory\bin\codecwav-20101023.jar;**USERSDIR**\Instances\SkyFactory\bin\libraryjavasound-20101123.jar;**USERSDIR**\Instances\SkyFactory\bin\librarylwjglopenal-20100824.jar;**USERSDIR**\Instances\SkyFactory\bin\soundsystem-20120107.jar;**USERSDIR**\Instances\SkyFactory\bin\argo-2.25_fixed.jar;**USERSDIR**\Instances\SkyFactory\bin\bcprov-jdk15on-1.47.jar;**USERSDIR**\Instances\SkyFactory\bin\guava-14.0.jar;**USERSDIR**\Instances\SkyFactory\bin\commons-lang3-3.1.jar;**USERSDIR**\Instances\SkyFactory\bin\commons-io-2.4.jar;**USERSDIR**\Instances\SkyFactory\bin\jinput-2.0.5.jar;**USERSDIR**\Instances\SkyFactory\bin\jutils-1.0.0.jar;**USERSDIR**\Instances\SkyFactory\bin\gson-2.2.2.jar;**USERSDIR**\Instances\SkyFactory\bin\lwjgl-2.9.0.jar;**USERSDIR**\Instances\SkyFactory\bin\lwjgl_util-2.9.0.jar;**USERSDIR**\Instances\SkyFactory\bin\minecraft.jar, net.minecraft.launchwrapper.Launch, --username, REDACTED, --session, token:REDACTED:REDACTED, --version, 1.6.4, --gameDir, **USERSDIR**\Instances\SkyFactory, --assetsDir, **USERSDIR**\Configs\Resources\virtual\legacy, --width=1600, --height=900, --tweakClass=cpw.mods.fml.common.launcher.FMLTweaker]
[28/12/2014 20:09:14 PM] Dec 28, 2014 8:09:13 PM net.minecraft.launchwrapper.LogWrapper log
[28/12/2014 20:09:14 PM] INFO: Loading tweak class name cpw.mods.fml.common.launcher.FMLTweaker
[28/12/2014 20:09:14 PM] Dec 28, 2014 8:09:14 PM net.minecraft.launchwrapper.LogWrapper log
[28/12/2014 20:09:14 PM] INFO: Using primary tweak class name cpw.mods.fml.common.launcher.FMLTweaker
[28/12/2014 20:09:14 PM] Dec 28, 2014 8:09:14 PM net.minecraft.launchwrapper.LogWrapper log
[28/12/2014 20:09:14 PM] INFO: Calling tweak class cpw.mods.fml.common.launcher.FMLTweaker
[28/12/2014 20:09:14 PM] [INFO] [ForgeModLoader] Forge Mod Loader version 6.4.49.965 for Minecraft 1.6.4 loading
[28/12/2014 20:09:14 PM] [INFO] [ForgeModLoader] Java is Java HotSpot(TM) 64-Bit Server VM, version 1.8.0_25, running on Windows 8.1:amd64:6.3, installed at C:\Program Files\Java\jre1.8.0_25
[28/12/2014 20:09:14 PM] [WARNING] [ForgeModLoader] The coremod codechicken.core.launch.DepLoader does not have a MCVersion annotation, it may cause issues with this version of Minecraft
[28/12/2014 20:09:14 PM] [WARNING] [ForgeModLoader] The coremod appeng.transformer.AppEngCore does not have a MCVersion annotation, it may cause issues with this version of Minecraft
[28/12/2014 20:09:14 PM] [INFO] [ForgeModLoader] [AppEng] Core Init
[28/12/2014 20:09:14 PM] [WARNING] [ForgeModLoader] The coremod codechicken.core.launch.CodeChickenCorePlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
[28/12/2014 20:09:15 PM] [WARNING] [ForgeModLoader] The coremod cofh.asm.LoadingPlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
[28/12/2014 20:09:15 PM] [WARNING] [ForgeModLoader] The coremod invtweaks.forge.asm.FMLPlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
[28/12/2014 20:09:15 PM] [WARNING] [ForgeModLoader] The coremod mcp.mobius.mobiuscore.asm.CoreDescription does not have a MCVersion annotation, it may cause issues with this version of Minecraft
[28/12/2014 20:09:15 PM] [WARNING] [ForgeModLoader] The coremod codechicken.nei.asm.NEICorePlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
[28/12/2014 20:09:15 PM] [WARNING] [ForgeModLoader] The coremod openblocks.OpenBlocksCorePlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
[28/12/2014 20:09:15 PM] [WARNING] [ForgeModLoader] The coremod openeye.CorePlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
[28/12/2014 20:09:15 PM] [WARNING] [ForgeModLoader] The coremod openmods.OpenModsCorePlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
[28/12/2014 20:09:15 PM] [WARNING] [ForgeModLoader] The coremod tconstruct.preloader.TConstructLoaderContainer does not have a MCVersion annotation, it may cause issues with this version of Minecraft
[28/12/2014 20:09:15 PM] [INFO] [TCon-Preloader] Scalpel. Suction. Lumber axe. CLEAR! *zap*
[28/12/2014 20:09:15 PM] [INFO] [TCon-Preloader] Constructing preloader (Modules: [tconstruct.preloader.AccessTransformers, tconstruct.preloader.ASMInterfaceRepair])
[28/12/2014 20:09:15 PM] [INFO] [TCon-Preloader] Found a properties file. Attempting load...
[28/12/2014 20:09:15 PM] [INFO] [TCon-Preloader] Loaded properties successfully. Using specified settings.
[28/12/2014 20:09:15 PM] [WARNING] [ForgeModLoader] The coremod portablejim.veinminer.asm.VeinMinerCorePlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
[28/12/2014 20:09:15 PM] [INFO] [ForgeModLoader] Loading tweak class name cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker
[28/12/2014 20:09:15 PM] [INFO] [ForgeModLoader] Loading tweak class name cpw.mods.fml.common.launcher.FMLDeobfTweaker
[28/12/2014 20:09:16 PM] [INFO] [ForgeModLoader] Calling tweak class cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker
[28/12/2014 20:09:16 PM] [SEVERE] [ForgeModLoader] Unable to launch
[28/12/2014 20:09:16 PM] java.util.ConcurrentModificationException
[28/12/2014 20:09:16 PM] at java.util.ArrayList$Itr.checkForComodification(Unknown Source)
[28/12/2014 20:09:16 PM] at java.util.ArrayList$Itr.remove(Unknown Source)
[28/12/2014 20:09:16 PM] at net.minecraft.launchwrapper.Launch.launch(Launch.java:114)
[28/12/2014 20:09:16 PM] at net.minecraft.launchwrapper.Launch.main(Launch.java:27)
[28/12/2014 20:09:16 PM] Java HotSpot(TM) 64-Bit Server VM warning: Using incremental CMS is deprecated and will likely be removed in a future release
[28/12/2014 20:09:16 PM] Checking for updated files!
[28/12/2014 20:09:17 PM] No updates found!
[28/12/2014 20:09:22 PM] Copied Log to clipboard