java.util.ConcurrentModificationException
	at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:901)
	at java.util.ArrayList$Itr.next(ArrayList.java:851)
	at betterquesting.questing.QuestInstance.writeToJson_Progress(QuestInstance.java:1021)
	at betterquesting.questing.QuestInstance.writeToNBT(QuestInstance.java:922)
	at betterquesting.questing.QuestInstance.getSyncPacket(QuestInstance.java:704)
	at betterquesting.handlers.EventHandler.onLivingUpdate(EventHandler.java:182)
	at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_1068_EventHandler_onLivingUpdate_LivingUpdateEvent.invoke(.dynamic)
	at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90)
	at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:179)
	at net.minecraftforge.common.ForgeHooks.onLivingUpdate(ForgeHooks.java:556)
	at net.minecraft.entity.EntityLivingBase.func_70071_h_(EntityLivingBase.java:2086)
	at net.minecraft.entity.player.EntityPlayer.func_70071_h_(EntityPlayer.java:234)
	at net.minecraft.entity.player.EntityPlayerMP.func_71127_g(EntityPlayerMP.java:382)
	at net.minecraft.network.NetHandlerPlayServer.func_73660_a(NetHandlerPlayServer.java:173)
	at net.minecraftforge.fml.common.network.handshake.NetworkDispatcher$1.func_73660_a(NetworkDispatcher.java:209)
	at net.minecraft.network.NetworkManager.func_74428_b(NetworkManager.java:285)
	at net.minecraft.network.NetworkSystem.func_151269_c(NetworkSystem.java:180)
	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:788)
	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:666)
	at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:185)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:524)
	at java.lang.Thread.run(Thread.java:745)