IC2 crahing Minecraft on launch even when only mod in folder

    for some reason it seems 2 items in IC2 are trying to take the same item ID from what i can understand in the error message


    here's the message:


    Mods loaded: 4
    ModLoader 1.1
    mod_MinecraftForge 1.3.3.12
    mod_ModLoaderMp 1.1
    mod_IC2 v1.64


    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 support@mojang.com.
    Please include a description of what you did when the error occured.




    --- BEGIN ERROR REPORT c48283f5 --------
    Generated 2/17/12 12:15 PM


    Minecraft: Minecraft 1.1
    OS: Windows 7 (amd64) version 6.1
    Java: 1.7.0_02, Oracle Corporation
    VM: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
    LWJGL: 2.4.2
    OpenGL: AMD Radeon HD 6750M version 4.1.10428 Compatibility Profile Context, ATI Technologies Inc.


    java.lang.IllegalArgumentException: Slot 218 is already occupied by ic2.common.BlockLuminator@4e11e5b8 when adding ic2.common.BlockCrop@7900bb12
    at oe.<init>(Block.java:176)
    at aew.<init>(BlockContainer.java:7)
    at ic2.platform.BlockContainerCommon.<init>(BlockContainerCommon.java:8)
    at ic2.common.BlockCrop.<init>(BlockCrop.java:32)
    at mod_IC2.initialize(mod_IC2.java:303)
    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(SourceFile:265)
    at net.minecraft.client.Minecraft.run(SourceFile:648)
    at java.lang.Thread.run(Unknown Source)
    --- END ERROR REPORT 94d58563 ----------

    EDIT!
    You are using the wrong forge version. You need 1.3.1, the others are incompatible with IC2 for now.


    If that is not the reason, the old answer:
    Your config is really messed up if that happens. Backup everything and delete .minecraft/config/IC2.cfg to let it generate a new one, this will most likely destroy your old IC2-worlds if you try to load them afterwards.