[21:25:09] [Craft Scheduler Thread - 19545/WARN]: Exception in thread "Craft Scheduler Thread - 19545"
[21:25:09] [Craft Scheduler Thread - 19545/WARN]: org.apache.commons.lang.UnhandledException: Plugin Sandbot v3.1-Beta generated an exception while executing task 42
        at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:56)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.IllegalStateException: Asynchronous entity world add!
        at org.spigotmc.AsyncCatcher.catchOp(AsyncCatcher.java:12)
        at net.minecraft.server.v1_8_R3.World.b(World.java:3882)
        at net.minecraft.server.v1_8_R3.Chunk.addEntities(Chunk.java:918)
        at org.bukkit.craftbukkit.v1_8_R3.chunkio.ChunkIOProvider.callStage2(ChunkIOProvider.java:52)
        at org.bukkit.craftbukkit.v1_8_R3.chunkio.ChunkIOProvider.callStage2(ChunkIOProvider.java:1)
        at org.bukkit.craftbukkit.v1_8_R3.util.AsynchronousExecutor.skipQueue(AsynchronousExecutor.java:337)
        at org.bukkit.craftbukkit.v1_8_R3.util.AsynchronousExecutor.getSkipQueue(AsynchronousExecutor.java:295)
        at org.bukkit.craftbukkit.v1_8_R3.chunkio.ChunkIOExecutor.syncChunkLoad(ChunkIOExecutor.java:17)
        at net.minecraft.server.v1_8_R3.ChunkProviderServer.getChunkAt(ChunkProviderServer.java:137)
        at net.minecraft.server.v1_8_R3.ChunkProviderServer.getChunkAt(ChunkProviderServer.java:119)
        at org.bukkit.craftbukkit.v1_8_R3.CraftWorld.getChunkAt(CraftWorld.java:145)
        at org.bukkit.craftbukkit.v1_8_R3.CraftWorld.getBlockAt(CraftWorld.java:91)
        at me.elapsed.plugin.sandbot.runnables.CacheSpawn.run(CacheSpawn.java:51)
        at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftTask.run(CraftTask.java:63)
        at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:53)
        ... 3 more

[21:25:09] [Server thread/ERROR]: Encountered an unexpected exception
net.minecraft.server.v1_8_R3.ReportedException: Exception ticking world
        at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:912) ~[factions.jar:git-TacoSpigot-04511af6]
        at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:888) ~[factions.jar:git-TacoSpigot-04511af6]
        at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:784) ~[factions.jar:git-TacoSpigot-04511af6]
        at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:683) [factions.jar:git-TacoSpigot-04511af6]
        at java.lang.Thread.run(Thread.java:748) [?:1.8.0_252]
Caused by: java.lang.NullPointerException
        at it.unimi.dsi.fastutil.longs.Long2ObjectOpenHashMap$MapIterator.nextEntry(Long2ObjectOpenHashMap.java:629) ~[factions.jar:git-TacoSpigot-04511af6]
        at it.unimi.dsi.fastutil.longs.Long2ObjectOpenHashMap$ValueIterator.next(Long2ObjectOpenHashMap.java:883) ~[factions.jar:git-TacoSpigot-04511af6]
        at java.util.Iterator.forEachRemaining(Iterator.java:116) ~[?:1.8.0_252]
        at java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801) ~[?:1.8.0_252]
        at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:482) ~[?:1.8.0_252]
        at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:472) ~[?:1.8.0_252]
        at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708) ~[?:1.8.0_252]
        at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[?:1.8.0_252]
        at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:566) ~[?:1.8.0_252]
        at net.minecraft.server.v1_8_R3.SpawnerCreature.getEntityCount(SpawnerCreature.java:31) ~[factions.jar:git-TacoSpigot-04511af6]
        at net.minecraft.server.v1_8_R3.SpawnerCreature.a(SpawnerCreature.java:130) ~[factions.jar:git-TacoSpigot-04511af6]
        at net.minecraft.server.v1_8_R3.WorldServer.doTick(WorldServer.java:233) ~[factions.jar:git-TacoSpigot-04511af6]
        at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:901) ~[factions.jar:git-TacoSpigot-04511af6]
        ... 4 more
[21:25:09] [Server thread/ERROR]:       Cause of unexpected exception was
java.lang.NullPointerException
        at it.unimi.dsi.fastutil.longs.Long2ObjectOpenHashMap$MapIterator.nextEntry(Long2ObjectOpenHashMap.java:629) ~[factions.jar:git-TacoSpigot-04511af6]
        at it.unimi.dsi.fastutil.longs.Long2ObjectOpenHashMap$ValueIterator.next(Long2ObjectOpenHashMap.java:883) ~[factions.jar:git-TacoSpigot-04511af6]
        at java.util.Iterator.forEachRemaining(Iterator.java:116) ~[?:1.8.0_252]
        at java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801) ~[?:1.8.0_252]
        at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:482) ~[?:1.8.0_252]
        at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:472) ~[?:1.8.0_252]
        at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708) ~[?:1.8.0_252]
        at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[?:1.8.0_252]
        at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:566) ~[?:1.8.0_252]
        at net.minecraft.server.v1_8_R3.SpawnerCreature.getEntityCount(SpawnerCreature.java:31) ~[factions.jar:git-TacoSpigot-04511af6]
        at net.minecraft.server.v1_8_R3.SpawnerCreature.a(SpawnerCreature.java:130) ~[factions.jar:git-TacoSpigot-04511af6]
        at net.minecraft.server.v1_8_R3.WorldServer.doTick(WorldServer.java:233) ~[factions.jar:git-TacoSpigot-04511af6]
        at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:901) ~[factions.jar:git-TacoSpigot-04511af6]
        at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:888) ~[factions.jar:git-TacoSpigot-04511af6]
        at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:784) ~[factions.jar:git-TacoSpigot-04511af6]
        at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:683) [factions.jar:git-TacoSpigot-04511af6]
        at java.lang.Thread.run(Thread.java:748) [?:1.8.0_252]