[00:22:27] [Craft Scheduler Thread - 8/WARN]: Exception in thread "Craft Scheduler Thread - 8"
[00:22:27] [Craft Scheduler Thread - 8/WARN]: org.apache.commons.lang.UnhandledException: Plugin uCarsTrade v5.1 generated an exception while executing task 4016
	at org.bukkit.craftbukkit.v1_7_R1.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 net.minecraft.server.v1_7_R1.World.a(World.java:2483)
	at net.minecraft.server.v1_7_R1.Chunk.addEntities(Chunk.java:765)
	at org.bukkit.craftbukkit.v1_7_R1.chunkio.ChunkIOProvider.callStage2(ChunkIOProvider.java:40)
	at org.bukkit.craftbukkit.v1_7_R1.chunkio.ChunkIOProvider.callStage2(ChunkIOProvider.java:13)
	at org.bukkit.craftbukkit.v1_7_R1.util.AsynchronousExecutor.skipQueue(AsynchronousExecutor.java:337)
	at org.bukkit.craftbukkit.v1_7_R1.util.AsynchronousExecutor.getSkipQueue(AsynchronousExecutor.java:295)
	at org.bukkit.craftbukkit.v1_7_R1.chunkio.ChunkIOExecutor.syncChunkLoad(ChunkIOExecutor.java:16)
	at net.minecraft.server.v1_7_R1.ChunkProviderServer.getChunkAt(ChunkProviderServer.java:107)
	at net.minecraft.server.v1_7_R1.ChunkProviderServer.getChunkAt(ChunkProviderServer.java:89)
	at org.bukkit.craftbukkit.v1_7_R1.CraftWorld.getChunkAt(CraftWorld.java:118)
	at org.bukkit.craftbukkit.v1_7_R1.CraftWorld.getBlockAt(CraftWorld.java:82)
	at org.bukkit.craftbukkit.v1_7_R1.block.CraftBlock.getRelative(CraftBlock.java:170)
	at org.bukkit.craftbukkit.v1_7_R1.block.CraftBlock.getRelative(CraftBlock.java:178)
	at net.stormdev.ucars.trade.AIVehicles.AISpawnManager.doLongSpawns(AISpawnManager.java:87)
	at net.stormdev.ucars.trade.AIVehicles.AISpawnManager$1.run(AISpawnManager.java:56)
	at org.bukkit.craftbukkit.v1_7_R1.scheduler.CraftTask.run(CraftTask.java:67)
	at org.bukkit.craftbukkit.v1_7_R1.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:53)
	... 3 more