why dose my tekkit keep crashing after i had to use the backup

[mtndew90]

Mods loaded: 47

ModLoader 1.1

mod_ModLoaderMp 1.1v4

mod_MinecraftForge 1.3.3.12

mod_NotEnoughItems 1.1.1

mod_ReiMinimap v3.0_01 [1.1]

mod_BuildCraftCore 2.2.12

mod_BuildCraftBuilders 2.2.12

mod_BuildCraftEnergy 2.2.12

mod_BuildCraftFactory 2.2.12

mod_BuildCraftTransport 2.2.12

mod_IC2 v1.70

mod_IC2 v1.70

mod_IC2AdvancedMachines v3.6

mod_PowerConverters 1.1.0R1.3.1

mod_RedPowerArray 2.0pr4d

mod_RedPowerCore 2.0pr4d

mod_RedPowerLighting 2.0pr4d

mod_RedPowerLogic 2.0pr4d

mod_RedPowerMachine 2.0pr4d

mod_RedPowerWiring 2.0pr4d

mod_RedPowerWorld 2.0pr4d

mod_Clevercraft 1.6.2

mod_ItemDescriptions 1.3

mod_EnderChest 1.0.1

mod_Forestry 1.2.6.4

mod_zAdditionalPipes Rev32.3

mod_CCTurtle 1.3

mod_ComputerCraft 1.3

mod_DoorFix 1.1.0

mod_EE EE2 v1.0.0

mod_Forestry 1.2.6.4

mod_InvTweaks 1.38 (1.1)

mod_MAtmos_forModLoader r10 for 1.1.x

mod_CompactSolars 1.2

mod_IC2_ChargingBench 1.71-1

mod_NetherOres 1.1.0R1.1.2

mod_RailcraftAutomation 3.3.1

mod_RailcraftBuildcraft 3.3.1

mod_RailcraftCore 3.3.1

mod_RailcraftExtras 3.3.1

mod_RailcraftFactory 3.3.1

mod_RailcraftIC2 3.3.1

mod_RailcraftInfrastructure 3.3.1

mod_RailcraftRails 3.3.1

Balkon's WeaponMod 1.1.0 v8.4.0 SMP Edition

mod_WirelessRedstone 1.5

mod_WirelessRedstoneClient 1.5

Minecraft has crashed!

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

Minecraft has stopped running because it encountered a problem.

If you wish to report this, please copy this entire text and email it to [email protected].

Please include a description of what you did when the error occured.

--- BEGIN ERROR REPORT 395d2008 --------

Generated 4/2/12 9:14 AM

Minecraft: Minecraft 1.1

OS: Windows 7 (amd64) version 6.1

Java: 1.6.0_31, Sun Microsystems Inc.

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

LWJGL: 2.4.2

OpenGL: Intel® HD Graphics version 2.1.0 - Build 8.15.10.2202, Intel

java.lang.IllegalArgumentException: Slot 249 is already occupied by ic2.common.BlockTex@68a48d59 when adding ic2.common.BlockTex@b3c03bb

at oe.<init>(Block.java:176)

at oe.<init>(Block.java:204)

at ic2.platform.BlockCommon.<init>(BlockCommon.java:12)

at ic2.common.BlockTex.<init>(BlockTex.java:30)

at mod_IC2.initialize(mod_IC2.java:201)

at ic2.platform.Ic2.load(Ic2.java:65)

at ModLoader.init(ModLoader.java:824)

at ModLoader.AddAllRenderers(ModLoader.java:189)

at afq.<init>(afq.java:80)

at afq.<clinit>(afq.java:9)

at net.minecraft.client.Minecraft.a(Minecraft.java:316)

at net.minecraft.client.Minecraft.run(Minecraft.java:624)

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

--- END ERROR REPORT 2ba8621d ----------

this keeps hapaning when i start up tekkit i just had to use the backup because i deleted a folder so i used the backup and this started hapaning