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java.lang.NullPointerException: 	at io.github.dre2n.dungeonsxl.world.EditWorld.getByWorld(EditWorld.java:310)	at io.github.dre2n.dungeonsxl.listener.EntityListener.onCreatureSpawn(EntityListener.java:66)	at sun.reflect.GeneratedMethodAccessor71.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:498)	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:334)	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)	at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:507)	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:492)	at org.bukkit.craftbukkit.v1_7_R4.event.CraftEventFactory.callCreatureSpawnEvent(CraftEventFactory.java:272)	at net.minecraft.world.World.addEntity(World.java:1762)	at net.minecraft.world.SpawnerAnimals.func_77192_a(SpawnerAnimals.java:212)	at net.minecraft.world.WorldServer.func_72835_b(WorldServer.java:258)	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:931)	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)