[17:56:00 WARN]: Exception in thread "Timer-0"
[17:56:00 WARN]: java.lang.IllegalStateException: Asynchronous entity track!
[17:56:00 WARN]:        at org.spigotmc.AsyncCatcher.catchOp(AsyncCatcher.java:14)
[17:56:00 WARN]:        at net.minecraft.server.v1_10_R1.EntityTracker.addEntity(EntityTracker.java:104)
[17:56:00 WARN]:        at net.minecraft.server.v1_10_R1.EntityTracker.track(EntityTracker.java:80)
[17:56:00 WARN]:        at net.minecraft.server.v1_10_R1.WorldManager.a(WorldManager.java:19)
[17:56:00 WARN]:        at net.minecraft.server.v1_10_R1.World.b(World.java:1028)
[17:56:00 WARN]:        at net.minecraft.server.v1_10_R1.WorldServer.b(WorldServer.java:1126)
[17:56:00 WARN]:        at net.minecraft.server.v1_10_R1.WorldServer.a(WorldServer.java:1091)
[17:56:00 WARN]:        at net.minecraft.server.v1_10_R1.Chunk.addEntities(Chunk.java:753)
[17:56:00 WARN]:        at org.bukkit.craftbukkit.v1_10_R1.chunkio.ChunkIOProvider.callStage2(ChunkIOProvider.java:45)
[17:56:00 WARN]:        at org.bukkit.craftbukkit.v1_10_R1.chunkio.ChunkIOProvider.callStage2(ChunkIOProvider.java:1)
[17:56:00 WARN]:        at org.bukkit.craftbukkit.v1_10_R1.util.AsynchronousExecutor.skipQueue(AsynchronousExecutor.java:337)
[17:56:00 WARN]:        at org.bukkit.craftbukkit.v1_10_R1.util.AsynchronousExecutor.getSkipQueue(AsynchronousExecutor.java:295)
[17:56:00 WARN]:        at org.bukkit.craftbukkit.v1_10_R1.chunkio.ChunkIOExecutor.syncChunkLoad(ChunkIOExecutor.java:16)
[17:56:00 WARN]:        at net.minecraft.server.v1_10_R1.ChunkProviderServer.getChunkAt(ChunkProviderServer.java:136)
[17:56:00 WARN]:        at net.minecraft.server.v1_10_R1.ChunkProviderServer.getChunkAt(ChunkProviderServer.java:119)
[17:56:00 WARN]:        at net.minecraft.server.v1_10_R1.ChunkProviderServer.getChunkAt(ChunkProviderServer.java:115)
[17:56:00 WARN]:        at org.bukkit.craftbukkit.v1_10_R1.CraftWorld.getChunkAt(CraftWorld.java:129)
[17:56:00 WARN]:        at org.bukkit.craftbukkit.v1_10_R1.CraftWorld.getBlockAt(CraftWorld.java:93)
[17:56:00 WARN]:        at org.bukkit.craftbukkit.v1_10_R1.CraftWorld.getBlockAt(CraftWorld.java:559)
[17:56:00 WARN]:        at org.bukkit.Location.getBlock(Location.java:87)
[17:56:00 WARN]:        at com.Faweks1.spigot.Main.generateChests(Main.java:244)
[17:56:00 WARN]:        at com.Faweks1.spigot.Main$3.run(Main.java:143)
[17:56:00 WARN]:        at java.util.TimerThread.mainLoop(Unknown Source)
[17:56:00 WARN]:        at java.util.TimerThread.run(Unknown Source)