A wild error message appeared!

[Benbjamin123]

Title: A wild error message appeared!

Version: 3.1.2

OS: Windows 7

Java Version: 1.6

Description of Problem:

When I start up tekkit, Minecraft starts up and goes to the Mojang screen. Then it displays an error message. This is the message in its entirety. Please help me.

Error Messages:

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 8/14/12 7:39 PM

Minecraft: Minecraft 1.2.5

OS: Windows 7 (amd64) version 6.1

Java: 1.6.0_20, Sun Microsystems Inc.

VM: Java HotSpot 64-Bit Server VM (mixed mode), Sun Microsystems Inc.

LWJGL: 2.4.2

OpenGL: AMD M880G with ATI Mobility Radeon HD 4250 version 3.2.9704 Compatibility Profile Context, ATI Technologies Inc.

java.lang.IllegalArgumentException: Slot 241 is already occupied by codechicken.enderstorage.BlockEnderChest@8d8e0dc when adding ic2.common.BlockRubSapling@5692900d

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 bd9a6b48 ----------

Error Log: