java.lang.IllegalStateException Asynchronous entity add!
        at net.minecraft.server.v1_6_R3.World.addEntity(World.java:949)
        at org.bukkit.craftbukkit.v1_6_R3.CraftWorld.spawn(CraftWorld.java:1015)
        at org.bukkit.craftbukkit.v1_6_R3.CraftWorld.spawn(CraftWorld.java:784)
        at org.bukkit.craftbukkit.v1_6_R3.CraftWorld.spawnEntity(CraftWorld.java:341)
        at me.blackvein.quests.util.QuestMob.spawn(QuestMob.java:100)
        at me.blackvein.quests.Event.fire(Event.java:234)
        at me.blackvein.quests.Quester.takeQuest(Quester.java:123)
        at me.blackvein.quests.Quests$QuestPrompt.acceptInput(Quests.java:292)
        at org.bukkit.conversations.Conversation.acceptInput(Conversation.java:213)