Whenever i start tekkit i get this error

[Jemjem787]

Minecraft has crashed!

----------------------

Minecraft has stopped running because it encountered a problem.

--- BEGIN ERROR REPORT 1f2e317e --------

Generated 9/15/12 7:59 AM

Minecraft: Minecraft 1.2.5

OS: Windows 7 (amd64) version 6.1

Java: 1.7.0_01, Oracle Corporation

VM: Java HotSpot 64-Bit Server VM (mixed mode), Oracle Corporation

LWJGL: 2.4.2

OpenGL: Intel® HD Graphics 4000 version 3.3.0 - Build 8.15.10.2696, Intel

java.lang.IllegalArgumentException: Slot 241 is already occupied by codechicken.enderstorage.BlockEnderChest@7dc5abce when adding ic2.common.BlockRubSapling@3c92a1e4

at pb.<init>(Block.java:251)

at qk.<init>(SourceFile:11)

at qk.<init>(SourceFile:19)

at zc.<init>(SourceFile:19)

at ic2.common.BlockRubSapling.<init>(BlockRubSapling.java:24)

at mod_IC2.load(mod_IC2.java:224)

at cpw.mods.fml.common.modloader.ModLoaderModContainer.init(ModLoaderModContainer.java:356)

at cpw.mods.fml.common.Loader.modInit(Loader.java:273)

at cpw.mods.fml.common.Loader.initializeMods(Loader.java:628)

at cpw.mods.fml.client.FMLClientHandler.onLoadComplete(FMLClientHandler.java:223)

at net.minecraft.client.Minecraft.a(Minecraft.java:429)

at net.minecraft.client.Minecraft.run(Minecraft.java:738)

at java.lang.Thread.run(Unknown Source)

--- END ERROR REPORT 459c02bb ----------

[theprolo]

This goes in the bug section.

http://forums.technicpack.net/forums/tekkit-bug-board.13/