I apologize for the inconvenience, as this pack is in BETA stage and is being tested. We are working to fix the bugs. Although, it might be that you have not allocated enough ram to the Technic launcher.
here is the crash report if that helps
[B#272] Running C:\Program Files\Java\jdk1.8.0_31\bin\javaw.exe -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx8192m -Xincgc -XX:MaxPermSize=256m -Djava.library.path=C:\Users\david\AppData\Roaming\.technic\modpacks\cobble-quest\bin\natives -Dfml.core.libraries.mirror=http://mirror.technicpack.net/Technic/lib/fml/%s -Dminecraft.applet.TargetDirectory=C:\Users\david\AppData\Roaming\.technic\modpacks\cobble-quest -Djava.net.preferIPv4Stack=true -cp C:\Users\david\AppData\Roaming\.technic\cache\net\minecraft\launchwrapper\1.8\launchwrapper-1.8.jar;C:\Users\david\AppData\Roaming\.technic\cache\org\ow2\asm\asm-all\4.1\asm-all-4.1.jar;C:\Users\david\AppData\Roaming\.technic\cache\org\scala-lang\scala-library\2.10.2\scala-library-2.10.2.jar;C:\Users\david\AppData\Roaming\.technic\cache\org\scala-lang\scala-compiler\2.10.2\scala-compiler-2.10.2.jar;C:\Users\david\AppData\Roaming\.technic\cache\lzma\lzma\0.0.1\lzma-0.0.1.jar;C:\Users\david\AppData\Roaming\.technic\cache\net\sf\jopt-simple\jopt-simple\4.5\jopt-simple-4.5.jar;C:\Users\david\AppData\Roaming\.technic\cache\com\paulscode\codecjorbis\20101023\codecjorbis-20101023.jar;C:\Users\david\AppData\Roaming\.technic\cache\com\paulscode\codecwav\20101023\codecwav-20101023.jar;C:\Users\david\AppData\Roaming\.technic\cache\com\paulscode\libraryjavasound\20101123\libraryjavasound-20101123.jar;C:\Users\david\AppData\Roaming\.technic\cache\com\paulscode\librarylwjglopenal\20100824\librarylwjglopenal-20100824.jar;C:\Users\david\AppData\Roaming\.technic\cache\com\paulscode\soundsystem\20120107\soundsystem-20120107.jar;C:\Users\david\AppData\Roaming\.technic\cache\argo\argo\2.25_fixed\argo-2.25_fixed.jar;C:\Users\david\AppData\Roaming\.technic\cache\org\bouncycastle\bcprov-jdk15on\1.47\bcprov-jdk15on-1.47.jar;C:\Users\david\AppData\Roaming\.technic\cache\com\google\guava\guava\14.0\guava-14.0.jar;C:\Users\david\AppData\Roaming\.technic\cache\org\apache\commons\commons-lang3\3.1\commons-lang3-3.1.jar;C:\Users\david\AppData\Roaming\.technic\cache\commons-io\commons-io\2.4\commons-io-2.4.jar;C:\Users\david\AppData\Roaming\.technic\cache\net\java\jinput\jinput\2.0.5\jinput-2.0.5.jar;C:\Users\david\AppData\Roaming\.technic\cache\net\java\jutils\jutils\1.0.0\jutils-1.0.0.jar;C:\Users\david\AppData\Roaming\.technic\cache\com\google\code\gson\gson\2.2.2\gson-2.2.2.jar;C:\Users\david\AppData\Roaming\.technic\cache\org\lwjgl\lwjgl\lwjgl\2.9.0\lwjgl-2.9.0.jar;C:\Users\david\AppData\Roaming\.technic\cache\org\lwjgl\lwjgl\lwjgl_util\2.9.0\lwjgl_util-2.9.0.jar;C:\Users\david\AppData\Roaming\.technic\modpacks\cobble-quest\bin\modpack.jar;C:\Users\david\AppData\Roaming\.technic\modpacks\cobble-quest\bin\minecraft.jar net.minecraft.launchwrapper.Launch --username polar4104 --session token:762a02f8f4e34fd69f2af95f77b01b65:71daaae7035d46a4a8cabea573c300fd --version 1.6.4-Forge9.11.1.965 --gameDir C:\Users\david\AppData\Roaming\.technic\modpacks\cobble-quest --assetsDir C:\Users\david\AppData\Roaming\.technic\assets\virtual\legacy --tweakClass cpw.mods.fml.common.launcher.FMLTweaker --title Cobble Quest --icon C:\Users\david\AppData\Roaming\.technic\assets\packs\cobble-quest\icon.png
[B#272] C:\Program Files\Java\jdk1.8.0_31\bin\javaw.exe -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx8192m -Xincgc -XX:MaxPermSize=256m -Djava.library.path=C:\Users\david\AppData\Roaming\.technic\modpacks\cobble-quest\bin\natives -Dfml.core.libraries.mirror=http://mirror.technicpack.net/Technic/lib/fml/%s -Dminecraft.applet.TargetDirectory=C:\Users\david\AppData\Roaming\.technic\modpacks\cobble-quest -Djava.net.preferIPv4Stack=true -cp C:\Users\david\AppData\Roaming\.technic\cache\net\minecraft\launchwrapper\1.8\launchwrapper-1.8.jar;C:\Users\david\AppData\Roaming\.technic\cache\org\ow2\asm\asm-all\4.1\asm-all-4.1.jar;C:\Users\david\AppData\Roaming\.technic\cache\org\scala-lang\scala-library\2.10.2\scala-library-2.10.2.jar;C:\Users\david\AppData\Roaming\.technic\cache\org\scala-lang\scala-compiler\2.10.2\scala-compiler-2.10.2.jar;C:\Users\david\AppData\Roaming\.technic\cache\lzma\lzma\0.0.1\lzma-0.0.1.jar;C:\Users\david\AppData\Roaming\.technic\cache\net\sf\jopt-simple\jopt-simple\4.5\jopt-simple-4.5.jar;C:\Users\david\AppData\Roaming\.technic\cache\com\paulscode\codecjorbis\20101023\codecjorbis-20101023.jar;C:\Users\david\AppData\Roaming\.technic\cache\com\paulscode\codecwav\20101023\codecwav-20101023.jar;C:\Users\david\AppData\Roaming\.technic\cache\com\paulscode\libraryjavasound\20101123\libraryjavasound-20101123.jar;C:\Users\david\AppData\Roaming\.technic\cache\com\paulscode\librarylwjglopenal\20100824\librarylwjglopenal-20100824.jar;C:\Users\david\AppData\Roaming\.technic\cache\com\paulscode\soundsystem\20120107\soundsystem-20120107.jar;C:\Users\david\AppData\Roaming\.technic\cache\argo\argo\2.25_fixed\argo-2.25_fixed.jar;C:\Users\david\AppData\Roaming\.technic\cache\org\bouncycastle\bcprov-jdk15on\1.47\bcprov-jdk15on-1.47.jar;C:\Users\david\AppData\Roaming\.technic\cache\com\google\guava\guava\14.0\guava-14.0.jar;C:\Users\david\AppData\Roaming\.technic\cache\org\apache\commons\commons-lang3\3.1\commons-lang3-3.1.jar;C:\Users\david\AppData\Roaming\.technic\cache\commons-io\commons-io\2.4\commons-io-2.4.jar;C:\Users\david\AppData\Roaming\.technic\cache\net\java\jinput\jinput\2.0.5\jinput-2.0.5.jar;C:\Users\david\AppData\Roaming\.technic\cache\net\java\jutils\jutils\1.0.0\jutils-1.0.0.jar;C:\Users\david\AppData\Roaming\.technic\cache\com\google\code\gson\gson\2.2.2\gson-2.2.2.jar;C:\Users\david\AppData\Roaming\.technic\cache\org\lwjgl\lwjgl\lwjgl\2.9.0\lwjgl-2.9.0.jar;C:\Users\david\AppData\Roaming\.technic\cache\org\lwjgl\lwjgl\lwjgl_util\2.9.0\lwjgl_util-2.9.0.jar;C:\Users\david\AppData\Roaming\.technic\modpacks\cobble-quest\bin\modpack.jar;C:\Users\david\AppData\Roaming\.technic\modpacks\cobble-quest\bin\minecraft.jar net.minecraft.launchwrapper.Launch --username polar4104 --session token:762a02f8f4e34fd69f2af95f77b01b65:71daaae7035d46a4a8cabea573c300fd --version 1.6.4-Forge9.11.1.965 --gameDir C:\Users\david\AppData\Roaming\.technic\modpacks\cobble-quest --assetsDir C:\Users\david\AppData\Roaming\.technic\assets\virtual\legacy --tweakClass cpw.mods.fml.common.launcher.FMLTweaker --title Cobble Quest --icon C:\Users\david\AppData\Roaming\.technic\assets\packs\cobble-quest\icon.png
[B#272] Analytics Response [runModpack]: 200
[B#272] Feb 20, 2015 11:47:35 AM net.minecraft.launchwrapper.LogWrapper log
[B#272] INFO: Loading tweak class name cpw.mods.fml.common.launcher.FMLTweaker
[B#272] Feb 20, 2015 11:47:36 AM net.minecraft.launchwrapper.LogWrapper log
[B#272] INFO: Using primary tweak class name cpw.mods.fml.common.launcher.FMLTweaker
[B#272] Feb 20, 2015 11:47:36 AM net.minecraft.launchwrapper.LogWrapper log
[B#272] INFO: Calling tweak class cpw.mods.fml.common.launcher.FMLTweaker
[B#272] 2015-02-20 11:47:36 [INFO] [ForgeModLoader] Forge Mod Loader version 6.4.49.965 for Minecraft 1.6.4 loading
[B#272] 2015-02-20 11:47:36 [INFO] [ForgeModLoader] Java is Java HotSpot(TM) 64-Bit Server VM, version 1.8.0_31, running on Windows 8.1:amd64:6.3, installed at C:\Program Files\Java\jdk1.8.0_31\jre
[B#272] 2015-02-20 11:47:36 [WARNING] [ForgeModLoader] The coremod codechicken.core.launch.DepLoader does not have a MCVersion annotation, it may cause issues with this version of Minecraft
[B#272] 2015-02-20 11:47:36 [WARNING] [ForgeModLoader] The coremod appeng.transformer.AppEngCore does not have a MCVersion annotation, it may cause issues with this version of Minecraft
[B#272] 2015-02-20 11:47:36 [INFO] [ForgeModLoader] [AppEng] Core Init
[B#272] 2015-02-20 11:47:36 [WARNING] [ForgeModLoader] The coremod codechicken.core.launch.CodeChickenCorePlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
[B#272] 2015-02-20 11:47:37 [WARNING] [ForgeModLoader] The coremod cofh.asm.LoadingPlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
[B#272] 2015-02-20 11:47:37 [WARNING] [ForgeModLoader] The coremod ic2.core.coremod.IC2core does not have a MCVersion annotation, it may cause issues with this version of Minecraft
[B#272] 2015-02-20 11:47:37 [WARNING] [ForgeModLoader] The coremod invtweaks.forge.asm.FMLPlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
[B#272] 2015-02-20 11:47:37 [WARNING] [ForgeModLoader] The coremod micdoodle8.mods.miccore.MicdoodlePlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
[B#272] 2015-02-20 11:47:37 [WARNING] [ForgeModLoader] The coremod codechicken.nei.asm.NEICorePlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
[B#272] 2015-02-20 11:47:37 [WARNING] [ForgeModLoader] The coremod openblocks.CorePlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
[B#272] 2015-02-20 11:47:37 [WARNING] [ForgeModLoader] The coremod tconstruct.preloader.TConstructLoaderContainer does not have a MCVersion annotation, it may cause issues with this version of Minecraft
[B#272] 2015-02-20 11:47:37 [INFO] [TCon-Preloader] Scalpel. Suction. Lumber axe. CLEAR! *zap*
[B#272] 2015-02-20 11:47:37 [INFO] [TCon-Preloader] Constructing preloader (Modules: [tconstruct.preloader.AccessTransformers, tconstruct.preloader.ASMInterfaceRepair])
[B#272] 2015-02-20 11:47:37 [INFO] [TCon-Preloader] Found a properties file. Attempting load...
[B#272] 2015-02-20 11:47:37 [INFO] [TCon-Preloader] Loaded properties successfully. Using specified settings.
[B#272] 2015-02-20 11:47:37 [WARNING] [ForgeModLoader] The coremod universalelectricity.core.UELoader does not have a MCVersion annotation, it may cause issues with this version of Minecraft
[B#272] 2015-02-20 11:47:37 [INFO] [ForgeModLoader] Loading tweak class name cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker
[B#272] 2015-02-20 11:47:37 [INFO] [ForgeModLoader] Loading tweak class name cpw.mods.fml.common.launcher.FMLDeobfTweaker
[B#272] 2015-02-20 11:47:37 [INFO] [ForgeModLoader] Calling tweak class cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker
[B#272] 2015-02-20 11:47:37 [SEVERE] [ForgeModLoader] Unable to launch
[B#272] java.util.ConcurrentModificationException
[B#272] at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:901)
[B#272] at java.util.ArrayList$Itr.remove(ArrayList.java:865)
[B#272] at net.minecraft.launchwrapper.Launch.launch(Launch.java:114)
[B#272] at net.minecraft.launchwrapper.Launch.main(Launch.java:27)
[B#272] Java HotSpot(TM) 64-Bit Server VM warning: ignoring option MaxPermSize=256m; support was removed in 8.0
[B#272] Java HotSpot(TM) 64-Bit Server VM warning: Using incremental CMS is deprecated and will likely be removed in a future release
i found the issue Java 8 does not support minecraft 1.6.4 unless you use this mod it is a legacy java fix
http://files.minecraftforge.net/LegacyJavaFixer/legacyjavafixer-1.0.jar
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