Tekkit Server Trouble

[MikeyMatou11]

For some reason every time I start the server it stops it and says this:

Running: Ubuntu 64Bit VPS Server

Java: Java7

I try to start it and it says:

11:37:05 [sEVERE] at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)

11:37:05 [sEVERE] Unexpected exception

java.lang.IllegalArgumentException: Slot 241 is already occupied by codechicken.enderstorage.BlockEnderChest@208b4e03 when adding ic2.common.BlockRubSapling@19aeb7a6

at net.minecraft.server.Block.<init>(Block.java:181)

at net.minecraft.server.BlockFlower.<init>(SourceFile:11)

at net.minecraft.server.BlockFlower.<init>(SourceFile:19)

at net.minecraft.server.BlockSapling.<init>(BlockSapling.java:18)

at ic2.common.BlockRubSapling.<init>(BlockRubSapling.java:14)

at net.minecraft.server.mod_IC2.load(mod_IC2.java:289)

at cpw.mods.fml.common.modloader.ModLoaderModContainer.init(ModLoaderModContainer.java:351)

at cpw.mods.fml.common.Loader.modInit(Loader.java:263)

at cpw.mods.fml.common.Loader.initializeMods(Loader.java:618)

at cpw.mods.fml.server.FMLBukkitHandler.onLoadComplete(FMLBukkitHandler.java:142)

at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:176)

at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:438)

at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)

11:37:18 [iNFO] Stopping server

11:37:18 [sEVERE] Exception in thread "Thread-3"

11:37:18 [sEVERE] java.lang.IndexOutOfBoundsException: Index: 0, Size: 0

Then when I type start it says

11:36:01 [sEVERE] java.lang.IndexOutOfBoundsException: Index: 0, Size: 0

11:36:01 [sEVERE] at java.util.ArrayList.rangeCheck(ArrayList.java:604)

11:36:01 [sEVERE] at java.util.ArrayList.get(ArrayList.java:382)

11:36:01 [sEVERE] at net.minecraft.server.MinecraftServer.stop(MinecraftServer.java:424)

11:36:01 [sEVERE] at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:497)

11:36:01 [sEVERE] at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)

[theprolo]

You have a block ID error, which suggests that your download went wrong. Try redownloading the server.