Description: Exception in server tick loop

java.util.ConcurrentModificationException
at java.util.ArrayList$Itr.checkForComodification(Unknown Source)
at java.util.ArrayList$Itr.next(Unknown Source)
at CoroUtil.world.WorldDirector.tick(WorldDirector.java:219)
at CoroUtil.world.WorldDirectorManager.onTick(WorldDirectorManager.java:172)
at CoroUtil.forge.EventHandlerFML.tickServer(EventHandlerFML.java:67)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_2153_EventHandlerFML_tickServer_ServerTickEvent.invoke(.dynamic)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90)
at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:182)
at net.minecraftforge.fml.common.FMLCommonHandler.onPreServerTick(FMLCommonHandler.java:278)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:655)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:524)
at java.lang.Thread.run(Unknown Source)

Fixed in dev and a new build out to curse.