[tekkit crashed on mojang screen]

Title: tekkit crashed on mojang screen

Version: 3.1.2

OS: my computer runs on windows 8.1 and its an acer hp pavillion touchsmart 14 ultrabook

Java Version: i have no idea how can i find out

Description of Problem:

whenever i launch tekkit i crash

Error Messages:

where would i find this?

Error Log:

41 mods loaded

Optifine OptiFine_1.2.5_HD_S_C6

Minecraft Forge 3.3.8.164

FML v2.2.106.176

Forge Mod Loader version 2.2.106.176 for Minecraft 1.2.5

	mod_MinecraftForge : Initialized (modpack.jar)

	mod_CodeChickenCore : Initialized (modpack.jar)

	mod_NotEnoughItems : Initialized (modpack.jar)

	mod_ReiMinimap : Initialized ([1.2.5]ReiMinimap_v3.2_04.zip)

	mod_IC2AdvancedMachines : Initialized (AdvancedMachines_4.0_client.zip)

	mod_BuildCraftCore : Initialized (buildcraft-client-A-core-2.2.14.zip)

	mod_BuildCraftBuilders : Initialized (buildcraft-client-B-builders-2.2.14.zip)

	mod_BuildCraftEnergy : Initialized (buildcraft-client-B-energy-2.2.14.zip)

	mod_BuildCraftFactory : Initialized (buildcraft-client-B-factory-2.2.14.zip)

	mod_BuildCraftTransport : Initialized (buildcraft-client-B-transport-2.2.14.zip)

	mod_AdditionalPipes : Initialized (buildcraft-client-DA-additionalpipes-2.1.3.zip)

	mod_ccSensors : Initialized (ccSensors-client-MC125-B017pr1.zip)

	mod_CCTurtle : Initialized (ComputerCraft)

	mod_ComputerCraft : Initialized (ComputerCraft)

	mod_EE : Initialized (EE2ClientV1.4.6.5.jar)

	mod_EnderStorage : Initialized (EnderStorage-Client 1.1.3.zip)

	mod_IC2NuclearControl : Initialized (IC2NuclearControl_client_v1.1.10b.zip)

	mod_ImmibisCore : Initialized (immibis-core_49.1.1_for_1.2.5-client.jar)

	mod_IC2 : Pre-initialized (industrialcraft-2-client_1.97.jar)

	mod_InvTweaks : Pre-initialized (InvTweaks-1.41b-1.2.4.zip)

	mod_MAtmos_forModLoader : Pre-initialized (MAtmos_packaged.zip)

	mod_ModularForceFieldSystem : Pre-initialized (mffs_rev7_for_1.2.5-client.zip)

	mod_IC2_ChargingBench : Loaded (mod_chargingbench-client-1.95b-1.2.5-r1.zip)

	mod_CompactSolars : Loaded (mod_compactsolars-client-2.3.2.10.zip)

	mod_IronChest : Loaded (mod_ironchests-client-3.8.0.40.zip)

	mod_NetherOres : Loaded (NetherOres_Client_1.2.1.zip)

	mod_PowerConverters : Loaded (PowerConverters_Client_1.3.4.zip)

	mod_Railcraft : Loaded (Railcraft_Client_5.3.3.zip)

	mod_RedPowerControl : Loaded (RedPowerControl-2.0pr5b2.zip)

	mod_RedPowerCore : Loaded (RedPowerCore-2.0pr5b2.zip)

	mod_RedPowerLighting : Loaded (RedPowerLighting-2.0pr5b2.zip)

	mod_RedPowerLogic : Loaded (RedPowerLogic-2.0pr5b2.zip)

	mod_RedPowerMachine : Loaded (RedPowerMachine-2.0pr5b2.zip)

	mod_RedPowerWiring : Loaded (RedPowerWiring-2.0pr5b2.zip)

	mod_RedPowerWorld : Loaded (RedPowerWorld-2.0pr5b2.zip)

	mod_TubeStuff : Loaded (tubestuff_49.1.2_for_1.2.5-client.jar)

	mod_WeaponMod : Loaded (WeaponMod.zip)

	mod_WirelessRedstoneAddons : Loaded (WR-CBE Addons-Client 1.2.2.3.zip)

	mod_WirelessRedstoneCore : Loaded (WR-CBE Core-Client 1.2.2.3.zip)

	mod_WirelessRedstoneRedPower : Loaded (WR-CBE RedPower-Client 1.2.2.1.zip)

	mod_ImmiChunkLoaders : Loaded (zdimensional-anchor_rev3.2_for_1.2.5-client.jar)





      Minecraft has crashed!      

      ----------------------      



Minecraft has stopped running because it encountered a problem.









--- BEGIN ERROR REPORT 1f2e317e --------

Generated 12/13/13 5:15 PM



Minecraft: Minecraft 1.2.5

OS: Windows 8 (x86) version 6.2

Java: 1.7.0_25, Oracle Corporation

VM: Java HotSpot Client VM (mixed mode), Oracle Corporation

LWJGL: 2.9.0

OpenGL: Intel® HD Graphics 4000 version 4.0.0 - Build 9.18.10.3222, Intel



java.lang.IllegalArgumentException: Slot 241 is already occupied by codechicken.enderstorage.BlockEnderChest@50d67 when adding ic2.common.BlockRubSapling@1b31984

	at pb.<init>(Block.java:251)

	at qk.<init>(SourceFile:11)

	at qk.<init>(SourceFile:19)

	at zc.<init>(SourceFile:19)

	at ic2.common.BlockRubSapling.<init>(BlockRubSapling.java:24)

	at mod_IC2.load(mod_IC2.java:224)

	at cpw.mods.fml.common.modloader.ModLoaderModContainer.init(ModLoaderModContainer.java:356)

	at cpw.mods.fml.common.Loader.modInit(Loader.java:273)

	at cpw.mods.fml.common.Loader.initializeMods(Loader.java:628)

	at cpw.mods.fml.client.FMLClientHandler.onLoadComplete(FMLClientHandler.java:223)

	at net.minecraft.client.Minecraft.a(Minecraft.java:429)

	at net.minecraft.client.Minecraft.run(Minecraft.java:738)

	at java.lang.Thread.run(Unknown Source)

--- END ERROR REPORT 48f6e196 ----------