[15:35:06 WARN]: Exception in thread "Craft Scheduler Thread - 315"
[15:35:06 WARN]: org.apache.commons.lang.UnhandledException: Plugin MobFarmManager v1.0.0 generated an exception while executing task 12154
	at org.bukkit.craftbukkit.v1_8_R1.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:56)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.IllegalStateException: Asynchronous entity world add!
	at org.spigotmc.AsyncCatcher.catchOp(AsyncCatcher.java:14)
	at net.minecraft.server.v1_8_R1.World.b(World.java:2604)
	at net.minecraft.server.v1_8_R1.Chunk.addEntities(Chunk.java:793)
	at org.bukkit.craftbukkit.v1_8_R1.chunkio.ChunkIOProvider.callStage2(ChunkIOProvider.java:40)
	at org.bukkit.craftbukkit.v1_8_R1.chunkio.ChunkIOProvider.callStage2(ChunkIOProvider.java:1)
	at org.bukkit.craftbukkit.v1_8_R1.util.AsynchronousExecutor.skipQueue(AsynchronousExecutor.java:337)
	at org.bukkit.craftbukkit.v1_8_R1.util.AsynchronousExecutor.getSkipQueue(AsynchronousExecutor.java:295)
	at org.bukkit.craftbukkit.v1_8_R1.chunkio.ChunkIOExecutor.syncChunkLoad(ChunkIOExecutor.java:16)
	at net.minecraft.server.v1_8_R1.ChunkProviderServer.getChunkAt(ChunkProviderServer.java:113)
	at net.minecraft.server.v1_8_R1.ChunkProviderServer.getChunkAt(ChunkProviderServer.java:95)
	at org.bukkit.craftbukkit.v1_8_R1.CraftWorld.getChunkAt(CraftWorld.java:124)
	at Listeners.EntityListener$1.run(EntityListener.java:54)
	at org.bukkit.craftbukkit.v1_8_R1.scheduler.CraftTask.run(CraftTask.java:71)
	at org.bukkit.craftbukkit.v1_8_R1.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:53)
	... 3 more