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java.lang.IllegalStateException: Asynchronous entity track!	at org.spigotmc.AsyncCatcher.catchOp(AsyncCatcher.java:14)	at net.minecraft.server.v1_9_R1.EntityTracker.addEntity(EntityTracker.java:105)	at net.minecraft.server.v1_9_R1.EntityTracker.track(EntityTracker.java:81)	at net.minecraft.server.v1_9_R1.WorldManager.a(WorldManager.java:18)	at net.minecraft.server.v1_9_R1.World.b(World.java:989)	at net.minecraft.server.v1_9_R1.WorldServer.b(WorldServer.java:1113)	at net.minecraft.server.v1_9_R1.WorldServer.a(WorldServer.java:1078)	at net.minecraft.server.v1_9_R1.Chunk.addEntities(Chunk.java:753)	at org.bukkit.craftbukkit.v1_9_R1.chunkio.ChunkIOProvider.callStage2(ChunkIOProvider.java:45)	at org.bukkit.craftbukkit.v1_9_R1.chunkio.ChunkIOProvider.callStage2(ChunkIOProvider.java:1)	at org.bukkit.craftbukkit.v1_9_R1.util.AsynchronousExecutor.skipQueue(AsynchronousExecutor.java:337)	at org.bukkit.craftbukkit.v1_9_R1.util.AsynchronousExecutor.getSkipQueue(AsynchronousExecutor.java:295)	at org.bukkit.craftbukkit.v1_9_R1.chunkio.ChunkIOExecutor.syncChunkLoad(ChunkIOExecutor.java:16)	at net.minecraft.server.v1_9_R1.ChunkProviderServer.getChunkAt(ChunkProviderServer.java:131)	at net.minecraft.server.v1_9_R1.ChunkProviderServer.getChunkAt(ChunkProviderServer.java:113)	at org.bukkit.craftbukkit.v1_9_R1.CraftWorld.getChunkAt(CraftWorld.java:125)	at org.bukkit.craftbukkit.v1_9_R1.CraftWorld.getBlockAt(CraftWorld.java:89)	at org.bukkit.craftbukkit.v1_9_R1.CraftWorld.getBlockAt(CraftWorld.java:560)	at org.bukkit.Location.getBlock(Location.java:87)	at com.gmail.gaelitoelquesito.CustomNoteBlock.Detector.blockStop(Detector.java:39)	at sun.reflect.GeneratedMethodAccessor130.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:306)	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)	at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502)	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487)	at com.gmail.gaelitoelquesito.CustomNoteBlock.CNBAPI.SongPlaying$1.run(SongPlaying.java:93)	at java.lang.Thread.run(Thread.java:745)