java.util.ConcurrentModificationException
    at java.util.HashMap$HashIterator.nextEntry(HashMap.java:922)
    at java.util.HashMap$KeyIterator.next(HashMap.java:956)
    at lumien.randomthings.TileEntities.TileEntityWirelessLever.isPowered(TileEntityWirelessLever.java:125)
    at lumien.randomthings.Handler.CoreHandler.isBlockIndirectlyGettingPowered(CoreHandler.java:33)
    at net.minecraft.world.World.func_72864_z(World.java)
    at cofh.thermaldynamics.duct.attachments.ConnectionBase.onNeighborChange(ConnectionBase.java:117)
    at cofh.thermaldynamics.duct.attachments.servo.ServoBase.onNeighborChange(ServoBase.java:111)
    at cofh.thermaldynamics.block.TileTDBase.handleSideUpdate(TileTDBase.java:361)
    at cofh.thermaldynamics.block.TileTDBase.onNeighborBlockChange(TileTDBase.java:329)
    at cofh.thermaldynamics.multiblock.MultiBlockFormer.checkMutliBlock(MultiBlockFormer.java:36)
    at cofh.thermaldynamics.multiblock.MultiBlockFormer.formGrid(MultiBlockFormer.java:22)
    at cofh.thermaldynamics.block.TileTDBase.formGrid(TileTDBase.java:605)
    at cofh.thermaldynamics.block.TileTDBase.tickMultiBlock(TileTDBase.java:593)
    at cofh.thermaldynamics.core.WorldGridList.tickEnd(WorldGridList.java:89)
    at cofh.thermaldynamics.core.TickHandler.tick(TickHandler.java:95)
    at cpw.mods.fml.common.eventhandler.ASMEventHandler_622_TickHandler_tick_WorldTickEvent.invoke(.dynamic)
    at cpw.mods.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:54)
    at cpw.mods.fml.common.eventhandler.EventBus.post(EventBus.java:138)
    at cpw.mods.fml.common.FMLCommonHandler.onPostWorldTick(FMLCommonHandler.java:259)
    at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:974)
    at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:431)
    at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:809)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:669)
    at java.lang.Thread.run(Thread.java:745)