Support request: [2.1.3] Crash on startup after installing IC2

    Hi!
    This is my first post on the forum, and unfortunately, it's for an error.
    Here is my Log:



    Mods loaded: 10
    ModLoader 1.2.3
    mod_MinecraftForge 1.4.0.47
    mod_ModLoaderMp 1.2.3v3
    mod_TooManyItems 1.2.2/1.2.3 2012-03-03
    mod_BuildCraftCore 2.2.13
    mod_BuildCraftBuilders 2.2.13
    mod_BuildCraftEnergy 2.2.13
    mod_BuildCraftFactory 2.2.13
    mod_BuildCraftTransport 2.2.13
    mod_IC2 v1.81


    Minecraft has crashed!
    ----------------------


    Minecraft has stopped running because it encountered a problem.








    --- BEGIN ERROR REPORT 72481270 --------
    Generated 17/05/12 20.46


    Minecraft: Minecraft 1.2.3
    OS: Windows 7 (amd64) version 6.1
    Java: 1.6.0_30, Sun Microsystems Inc.
    VM: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Sun Microsystems Inc.
    LWJGL: 2.4.2
    OpenGL: GeForce GTX 560/PCIe/SSE2 version 4.2.0, NVIDIA Corporation


    java.lang.NoClassDefFoundError: forge/IEntityInteractHandler
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClassCond(Unknown Source)
    at java.lang.ClassLoader.defineClass(Unknown Source)
    at java.security.SecureClassLoader.defineClass(Unknown Source)
    at java.net.URLClassLoader.defineClass(Unknown Source)
    at java.net.URLClassLoader.access$000(Unknown Source)
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at mod_IC2.load(mod_IC2.java:315)
    at ModLoader.init(ModLoader.java:890)
    at ModLoader.addAllRenderers(ModLoader.java:186)
    at aho.<init>(aho.java:79)
    at aho.<clinit>(aho.java:9)
    at net.minecraft.client.Minecraft.a(Minecraft.java:395)
    at net.minecraft.client.Minecraft.run(Minecraft.java:732)
    at java.lang.Thread.run(Unknown Source)
    Caused by: java.lang.ClassNotFoundException: forge.IEntityInteractHandler
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    ... 19 more
    --- END ERROR REPORT 56d0a66b ----------




    Hope you can help me!!
    Thx in advance,
    Mauro!     :D :D