Craft Scheduler

[20:47:35] [Craft Scheduler Thread - 15160/WARN]: Exception in thread "Craft Scheduler Thread - 15160"
[20:47:35] [Craft Scheduler Thread - 15160/WARN]: org.apache.commons.lang.UnhandledException: Plugin RandomLocation v4.73 generated an exception while executing task 1929688
	at org.bukkit.craftbukkit.v1_7_R4.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:56)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:744)
Caused by: java.lang.IllegalStateException: Asynchronous entity world add!
	at org.spigotmc.AsyncCatcher.catchOp(AsyncCatcher.java:14)
	at net.minecraft.server.v1_7_R4.World.a(World.java:2625)
	at net.minecraft.server.v1_7_R4.Chunk.addEntities(Chunk.java:793)
	at org.bukkit.craftbukkit.v1_7_R4.chunkio.ChunkIOProvider.callStage2(ChunkIOProvider.java:40)
	at org.bukkit.craftbukkit.v1_7_R4.chunkio.ChunkIOProvider.callStage2(ChunkIOProvider.java:13)
	at org.bukkit.craftbukkit.v1_7_R4.util.AsynchronousExecutor.skipQueue(AsynchronousExecutor.java:337)
	at org.bukkit.craftbukkit.v1_7_R4.util.AsynchronousExecutor.getSkipQueue(AsynchronousExecutor.java:295)
	at org.bukkit.craftbukkit.v1_7_R4.chunkio.ChunkIOExecutor.syncChunkLoad(ChunkIOExecutor.java:16)
	at net.minecraft.server.v1_7_R4.ChunkProviderServer.getChunkAt(ChunkProviderServer.java:120)
	at net.minecraft.server.v1_7_R4.ChunkProviderServer.getChunkAt(ChunkProviderServer.java:102)
	at org.bukkit.craftbukkit.v1_7_R4.CraftWorld.getChunkAt(CraftWorld.java:121)
	at org.bukkit.craftbukkit.v1_7_R4.CraftWorld.getChunkAt(CraftWorld.java:539)
	at org.bukkit.Location.getChunk(Location.java:73)
	at me.ryanhamshire.GriefPrevention.DataStore.getClaimAt(DataStore.java:423)
	at me.xADudex.RandomLocation.Zone.checkLocation(Zone.java:755)
	at me.xADudex.RandomLocation.ZoneManager$1.run(ZoneManager.java:121)
	at org.bukkit.craftbukkit.v1_7_R4.scheduler.CraftTask.run(CraftTask.java:71)
	at org.bukkit.craftbukkit.v1_7_R4.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:53)
	... 3 more