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I currently have Modloader, Forge, IC2, EE, RP2, and Opti Fine installed and I was looking to add ThaumCraft after seeing Direwolf20's videos on it but when I tried to install it I got this error report:



--- BEGIN ERROR REPORT a84c27bf --------
Generated 6/20/12 6:34 PM

Minecraft: Minecraft 1.2.5
OS: Windows Vista (amd64) version 6.0
Java: 1.6.0_13, Sun Microsystems Inc.
VM: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Sun Microsystems Inc.
LWJGL: 2.4.2
OpenGL: Mobile Intel(R) 4 Series Express Chipset Family version 2.1.0 - Build 8.15.10.2202, Intel

java.lang.IllegalArgumentException: Slot 249 is already occupied by thaumcraft.world.BlockCustomPlants@3a3f4a21 when adding ic2.common.BlockTex@111bda67
at pb.<init>(Block.java:251)
at pb.<init>(Block.java:284)
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:324)
at cpw.mods.fml.common.Loader.modInit(Loader.java:263)
at cpw.mods.fml.common.Loader.initializeMods(Loader.java:604)
at cpw.mods.fml.client.FMLClientHandler.onLoadComplete(FMLClientHandler.java:203)
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 f0947b88 ----------