Small problem with crashes

I have a slight problem that is keeping me from using IC. I don't know what I did wrong... Help plz?

"Generated 5/28/12 11:19 AM

Minecraft: Minecraft 1.2.5
OS: Windows 7 (x86) version 6.1
Java: 1.6.0_23, Sun Microsystems Inc.
VM: Java HotSpot(TM) Client VM (mixed mode), Sun Microsystems Inc.
LWJGL: 2.4.2
OpenGL: ATI Radeon HD 5450 version 3.2.9704 Compatibility Profile Context, ATI Technologies Inc.

java.lang.IllegalArgumentException: Slot 249 is already occupied by ic2.common.BlockTex@11fc4b8 when adding ic2.common.BlockTex@ac4d3b
at pb.<init>(Block.java:249)
at pb.<init>(Block.java:281)
at ic2.platform.BlockCommon.<init>(BlockCommon.java:12)
at ic2.common.BlockTex.<init>(BlockTex.java:30)
at mod_IC2.load(mod_IC2.java:154)
at cpw.mods.fml.common.modloader.ModLoaderModContainer.init(ModLoaderModContainer.java:319)
at cpw.mods.fml.common.Loader.modInit(Loader.java:259)
at cpw.mods.fml.common.Loader.initializeMods(Loader.java:589)
at cpw.mods.fml.client.FMLClientHandler.onLoadComplete(FMLClientHandler.java:194)
at net.minecraft.client.Minecraft.a(Minecraft.java:426)
at net.minecraft.client.Minecraft.run(Minecraft.java:735)
at java.lang.Thread.run(Unknown Source)
--- END ERROR REPORT 9dc72428 ----------"

I just tried that, and unfortunately, it didn't work - wait, the whole config folder, or the file, cause i only did the file

nope, just 1...