java.util.ConcurrentModificationException
        at java.util.LinkedList$ListItr.checkForComodification(LinkedList.java:778)
        at java.util.LinkedList$ListItr.next(LinkedList.java:713)
        at com.eloraam.redpower.machine.TileTube.sendItemUpdate(TileTube.java:444)
        at com.eloraam.redpower.machine.TileTube.g(TileTube.java:172)
        at me.nallar.tickthreading.minecraft.tickregion.TileEntityTickRegion.doTick(TileEntityTickRegion.java:99)
        at me.nallar.tickthreading.minecraft.tickregion.TickRegion.run(TickRegion.java:42)
        at me.nallar.tickthreading.minecraft.ThreadManager$2.run(ThreadManager.java:90)
        at me.nallar.tickthreading.minecraft.ThreadManager$1.run(ThreadManager.java:41)
        at me.nallar.tickthreading.minecraft.ThreadManager$ServerWorkThread.run(ThreadManager.java:157)
03-17 23:14:53 [SEVERE] [TickThreading] Failed to send il@54e8cc79
java.util.ConcurrentModificationException
        at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:782)
        at java.util.ArrayList$Itr.next(ArrayList.java:754)
        at il.sendTiles(PlayerInstance.java:24)
        at il.a_lock(PlayerInstance.java)
        at il.a(PlayerInstance.java)
        at ik.b_net_minecraft_server_management_PlayerManager_updatePlayerInstances_p0(SourceFile:67)
        at ik.b(SourceFile)
        at in.b_net_minecraft_world_WorldServer_tick_p0(WorldServer.java:287)
        at in.b(WorldServer.java)
        at net.minecraft.server.MinecraftServer.doWorldTick(MinecraftServer.java:442)
        at me.nallar.patched.server.PatchMinecraftServer$TickRunnable.run(PatchMinecraftServer.java:543)
        at me.nallar.tickthreading.minecraft.ThreadManager$1.run(ThreadManager.java:41)
        at me.nallar.tickthreading.minecraft.ThreadManager$ServerWorkThread.run(ThreadManager.java:157)
03-17 23:15:16 [SEVERE] [TickThreading] Failed to send il@550b5f90
java.util.ConcurrentModificationException
        at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:782)
        at java.util.ArrayList$Itr.next(ArrayList.java:754)
        at il.sendTiles(PlayerInstance.java:24)
        at il.a_lock(PlayerInstance.java)
        at il.a(PlayerInstance.java)
        at ik.b_net_minecraft_server_management_PlayerManager_updatePlayerInstances_p0(SourceFile:67)
        at ik.b(SourceFile)
        at in.b_net_minecraft_world_WorldServer_tick_p0(WorldServer.java:287)
        at in.b(WorldServer.java)
        at net.minecraft.server.MinecraftServer.doWorldTick(MinecraftServer.java:442)
        at me.nallar.patched.server.PatchMinecraftServer$TickRunnable.run(PatchMinecraftServer.java:543)
        at me.nallar.tickthreading.minecraft.ThreadManager$1.run(ThreadManager.java:41)
        at me.nallar.tickthreading.minecraft.ThreadManager$ServerWorkThread.run(ThreadManager.java:157)