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I'm new here, but I have a feeling crashing after launch i'snt part of the pack. The crash text was as follows


Minecraft has crashed!
Minecraft has stopped running because it encountered a problem; Failed to start game
A full error report has been saved to C:\Users\Lachlan Potter\Desktop\Magic_World\minecraft\crash-reports\crash-2013-02-26_12.35.48-client.txt - Please include a copy of that file (Not this screen!) if you report this crash to anyone; without it, they will not be able to help fix the crash

--- BEGIN ERROR REPORT 842b75f6 -------- Full report at: C:\Users\Lachlan Potter\Desktop\Magic_World\minecraft\crash-reports\crash-2013-02-26_12.35.48-client.txt Please show that file to Mojang, NOT just this screen!
Generated 26/02/13 12:35 PM
-- System Details -- Details: Minecraft Version: 1.4.7 Operating System: Windows Vista (amd64) version 6.0 Java Version: 1.6.0_13, Sun Microsystems Inc. Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Sun Microsystems Inc. Memory: 196564776 bytes (187 MB) / 265093120 bytes (252 MB) up to 1069416448 bytes (1019 MB) JVM Flags: 5 total; -Xms256M -Xmx1024M -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:+AggressiveOpts AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used Suspicious classes: FML and Forge are installed IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0 FML: MCP v7.26a FML v4.7.32.553 Minecraft Forge 6.6.1.524 Feed The Beast Mod Pack 34 mods loaded, 34 mods active mcp [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed FML [Forge Mod Loader] (coremods) Unloaded->Constructed Forge [Minecraft Forge] (coremods) Unloaded->Constructed CodeChickenCore [CodeChicken Core] (coremods) Unloaded->Constructed NotEnoughItems [Not Enough Items] (coremods) Unloaded->Constructed BuildCraft|Core [BuildCraft] (buildcraft.jar) Unloaded->Constructed BuildCraft|Builders [BC Builders] (buildcraft.jar) Unloaded->Constructed BuildCraft|Energy [BC Energy] (buildcraft.jar) Unloaded->Constructed BuildCraft|Factory [BC Factory] (buildcraft.jar) Unloaded->Constructed BuildCraft|Transport [BC Transport] (buildcraft.jar) Unloaded->Constructed BuildCraft|Silicon [BC Silicon] (buildcraft.jar) Unloaded->Constructed ChickenChunks [ChickenChunks] (chickenchunks.jar) Unloaded->Constructed CoFHCore [CoFH Core] (CoFHCore.zip) Unloaded->Constructed EnderStorage [EnderStorage] (enderstorage.jar) Unloaded->Constructed ExtrabiomesXL [ExtrabiomesXL] (extrabiomes.jar) Unloaded->Constructed Forestry [Forestry for Minecraft] (forestry.jar) Unloaded->Constructed inventorytweaks_forge [Inventory Tweaks (Forge)] (InvTweaks.jar) Unloaded->Errored IronChest [Iron Chest] (IronChest.zip) Unloaded->Constructed Mystcraft [Mystcraft] (mystcraft.zip) Unloaded->Constructed NEIPlugins [NEI Plugins] (neiplugins.jar) Unloaded->Constructed ObsidiPlates [Obsidian Pressure Plates] (obsidiplates.zip) Unloaded->Constructed ThermalExpansion [Thermal Expansion] (thermalexpansion.zip) Unloaded->Constructed OmniTools [OmniTools] (omnitools.zip) Unloaded->Constructed Railcraft [Railcraft] (railcraft.jar) Unloaded->Constructed mod_ReiMinimap [mod_ReiMinimap] (reiminimap.zip) Unloaded->Constructed SecretRoomsMod [The SecretRoomsMod] (secretroomsmod.zip) Unloaded->Constructed SoulShards [SoulShards] (soulshards.zip) Unloaded->Constructed StevesCarts [Steve's Carts] (StevesCarts.zip) Unloaded->Constructed Thaumcraft [Thaumcraft] (Thaumcraft.zip) Unloaded->Constructed ThermalExpansion|Factory [Factory] (thermalexpansion.zip) Unloaded->Constructed ThermalExpansion|Energy [Energy] (thermalexpansion.zip) Unloaded->Constructed ThermalExpansion|Transport [Transport] (thermalexpansion.zip) Unloaded->Constructed TwilightForest [The Twilight Forest] (TwilightForest.zip) Unloaded->Constructed XReliquary [Xeno's Reliquary] (XReliquary.jar) Unloaded->Constructed LWJGL: 2.4.2 OpenGL: ATI Mobility Radeon HD 4570 GL version 2.1.8202 Release, ATI Technologies Inc. Is Modded: Definitely; Client brand changed to 'forge,fml' Type: Client (map_client.txt) Texture Pack: Default Profiler Position: N/A (disabled) Vec3 Pool Size: ~~ERROR~~ NullPointerException: null
cpw.mods.fml.common.LoaderException: java.lang.ClassNotFoundException: invtweaks.InvTweaksMod at cpw.mods.fml.common.LoadController.transition(LoadController.java:130) at cpw.mods.fml.common.Loader.loadMods(Loader.java:504) at cpw.mods.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:161) at net.minecraft.client.Minecraft.a(Minecraft.java:410) at asq.a(SourceFile:56) at net.minecraft.client.Minecraft.run(Minecraft.java:744) at java.lang.Thread.run(Unknown Source) Caused by: java.lang.ClassNotFoundException: invtweaks.InvTweaksMod at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:185) at java.lang.ClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at cpw.mods.fml.common.ModClassLoader.loadClass(ModClassLoader.java:57) at java.lang.ClassLoader.loadClassInternal(Unknown Source) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Unknown Source) at cpw.mods.fml.common.FMLModContainer.constructMod(FMLModContainer.java:418) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at com.google.common.eventbus.EventHandler.handleEvent(EventHandler.java:69) at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45) at com.google.common.eventbus.EventBus.dispatch(EventBus.java:317) at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:300) at com.google.common.eventbus.EventBus.post(EventBus.java:268) at cpw.mods.fml.common.LoadController.propogateStateMessage(LoadController.java:153) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at com.google.common.eventbus.EventHandler.handleEvent(EventHandler.java:69) at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45) at com.google.common.eventbus.EventBus.dispatch(EventBus.java:317) at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:300) at com.google.common.eventbus.EventBus.post(EventBus.java:268) at cpw.mods.fml.common.LoadController.distributeStateMessage(LoadController.java:86) at cpw.mods.fml.common.Loader.loadMods(Loader.java:494) ... 5 more Caused by: java.lang.UnsupportedClassVersionError: invtweaks/InvTweaksMod : Unsupported major.minor version 51.0 at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(Unknown Source) at java.security.SecureClassLoader.defineClass(Unknown Source) at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:174) ... 33 more --- END ERROR REPORT 3db1d28 ----------


Any help would be appreciated, thanks!