This keeps crashing my server please help..

java.lang.Error at sun.misc.Unsafe.park(Native Method) at java.util.concurrent.locks.LockSupport.park(Unknown Source) at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(Unknown Source) at java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireShared(Unknown Source) at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireShared(Unknown Source) at java.util.concurrent.locks.ReentrantReadWriteLock$ReadLock.lock(Unknown Source) at com.earth2me.essentials.storage.AsyncStorageObjectHolder.acquireReadLock(AsyncStorageObjectHolder.java:38) at
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com.earth2me.essentials.spawn.SpawnStorage.getSpawn(SpawnStorage.java:52) at com.earth2me.essentials.spawn.Commandspawn.respawn(Commandspawn.java:51) at com.earth2me.essentials.spawn.Commandspawn.run(Commandspawn.java:33) at com.earth2me.essentials.commands.EssentialsCommand.run(EssentialsCommand.java:150) at com.earth2me.essentials.Essentials.onCommandEssentials(Essentials.java:514) at com.earth2me.essentials.spawn.EssentialsSpawn.onCommand(EssentialsSpawn.java:64) at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:140) at org.bukkit.craftbukkit.v1_12_R1.CraftServer.dispatchCommand(CraftServer.java:628) at net.minecraft.server.v1_12_R1.PlayerConnection.handleCommand(PlayerConnection.java:1338) at net.minecraft.server.v1_12_R1.PlayerConnection.a(PlayerConnection.java:1198) at net.minecraft.server.v1_12_R1.PacketPlayInChat.a(SourceFile:37) at net.minecraft.server.v1_12_R1.PacketPlayInChat.a(SourceFile:9) at net.minecraft.server.v1_12_R1.PlayerConnectionUtils$1.run(SourceFile:13) at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) at java.util.concurrent.FutureTask.run(Unknown Source) at net.minecraft.server.v1_12_R1.SystemUtils.a(SourceFile:46) at net.minecraft.server.v1_12_R1.MinecraftServer.D(MinecraftServer.java:696) at net.minecraft.server.v1_12_R1.DedicatedServer.D(DedicatedServer.java:371) at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:651) at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:555) at java.lang.Thread.run(Unknown Source)

 

@Heera Full server log?