Block id already taken

[rostw]

whenever i start up technic pack it crashes and give me this error report "--- BEGIN ERROR REPORT 99402570 --------

Generated 4/14/12 9:10 AM

Minecraft: Minecraft 1.1

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: Intel® HD Graphics Family version 3.0.0 - Build 8.15.10.2353, Intel

java.lang.IllegalArgumentException: Slot 189 is already occupied by thaumcraft.BlockEffects@1016962 when adding ic2chargingbench.common.BlockChargingBench@1adb0d5

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

at aew.<init>(BlockContainer.java:7)

at ic2.platform.BlockContainerCommon.<init>(BlockContainerCommon.java:8)

at ic2.common.BlockMultiID.<init>(BlockMultiID.java:34)

at ic2chargingbench.common.BlockChargingBench.<init>(BlockChargingBench.java:16)

at mod_IC2_ChargingBench.load(mod_IC2_ChargingBench.java:38)

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 376b7cea ----------

can someone help me