Error

2012-09-27 20:23:50 [SEVERE] Unexpected exception
java.lang.RuntimeException: RedPowerCore: BlockID 155 occupied by buildcraft.builders.BlockFiller, autoAssign is disabled.
at forge.MinecraftForge.killMinecraft(MinecraftForge.java:477)
at eloraam.core.Config.getBlockID(Config.java:180)
at net.minecraft.server.RedPowerControl.initialize(RedPowerControl.java:40)
at net.minecraft.server.mod_RedPowerControl.initialize(mod_RedPowerControl.java:55)
at net.minecraft.server.mod_RedPowerControl.modsLoaded(mod_RedPowerControl.java:31)
at cpw.mods.fml.common.modloader.ModLoaderModContainer.postInit(ModLoaderModContainer.java:357)
at cpw.mods.fml.common.Loader.postModInit(Loader.java:280)
at cpw.mods.fml.common.Loader.initializeMods(Loader.java:619)
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)
2012-09-27 20:23:54 [INFO] Stopping server
2012-09-27 20:23:54 [SEVERE] java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
2012-09-27 20:23:54 [SEVERE] at java.util.ArrayList.rangeCheck(Unknown Source)
2012-09-27 20:23:54 [SEVERE] at java.util.ArrayList.get(Unknown Source)
2012-09-27 20:23:54 [SEVERE] at net.minecraft.server.MinecraftServer.stop(MinecraftServer.java:424)
2012-09-27 20:23:54 [SEVERE] at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:497)
2012-09-27 20:23:54 [SEVERE] at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)