Updating to Tekkit 3.1.2

[Creature24]

right so i try to update to tekkit 3.1.2 and minecraft/tekkit crashes and this comes up:

44 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_CodeChickenCore : Initialized (modpack.jar)

mod_MinecraftForge : Initialized (modpack.jar)

mod_NotEnoughItems : Initialized (modpack.jar)

mod_ReiMinimap : Initialized ([1.2.5]ReiMinimap_v3.2_03.zip)

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

mod_IC2 : Initialized (industrialcraft-2-client_1.97.jar)

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_ComputerCraft : Initialized (ComputerCraft)

mod_RedPowerMachine : Initialized (RedPowerMachine-2.0pr5b2.zip)

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

mod_CCTurtle : 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_InvTweaks : Initialized (InvTweaks-1.41b-1.2.4.zip)

mod_MAtmos_forModLoader : Initialized (MAtmos_packaged.zip)

mod_ModularForceFieldSystem : Initialized (mffs_rev5_for_1.2.5-client.zip)

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

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

mod_CompactSolars : Pre-initialized (mod_compactsolars-client-2.3.2.10.zip)

mod_IronChest : Pre-initialized (mod_ironchests-client-3.8.0.40.zip)

mod_RedPowerCore : Pre-initialized (RedPowerCore-2.0pr5b2.zip)

mod_NetherOres : Pre-initialized (NetherOres_Client_1.2.1.zip)

mod_PowerConverters : Pre-initialized (PowerConverters_Client_1.3.4.zip)

mod_Railcraft : Pre-initialized (Railcraft_Client_5.3.3.zip)

mod_RedPowerControl : Pre-initialized (RedPowerControl-2.0pr5b2.zip)

mod_RedPowerLighting : Pre-initialized (RedPowerLighting-2.0pr5b2.zip)

mod_RedPowerLogic : Pre-initialized (RedPowerLogic-2.0pr5b2.zip)

mod_RedPowerWiring : Pre-initialized (RedPowerWiring-2.0pr5b2.zip)

mod_RedPowerWorld : Pre-initialized (RedPowerWorld-2.0pr5b2.zip)

mod_TubeStuff : Pre-initialized (tubestuff_49.1.1_for_1.2.5-client.jar)

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

Balkon's WeaponMod : Pre-initialized (WeaponMod.zip)

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

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

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

mod_ImmiChunkLoaders : Pre-initialized (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 1961507b --------

Generated 08/08/12 10:51

Minecraft: Minecraft 1.2.5

OS: Windows 7 (x86) version 6.1

Java: 1.6.0_31, Sun Microsystems Inc.

VM: Java HotSpot Client VM (mixed mode), Sun Microsystems Inc.

LWJGL: 2.4.2

OpenGL: Mobile Intel® 4 Series Express Chipset Family version 2.1.0 - Build 8.15.10.2202, Intel

java.lang.IllegalArgumentException: Slot 255 is already occupied by mffs.BlockForceField@f85417 when adding mffs.BlockForceField@158e6d1

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

at pb.<init>(Block.java:284)

at agy.<init>(BlockContainer.java:13)

at mffs.BlockForceField.<init>(BlockForceField.java:30)

at mffs.mod_ModularForceFieldSystem.load(mod_ModularForceFieldSystem.java:115)

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 eb90b26f ----------

What should i do?

[Torezu]

What should i do?

Ordinarily, I would tell you to go post a bug report in the right spot. Today, I'll just issue a warning and tell you how to fix it.

Remove duplicate mod files from your tekkit\mods folder. Alternatively, back up your waypoints and any config files you really want to save, and delete your tekkit folder entirely. Then re-download.