Server Crashes Unexpectedly?

My server has been running fine, but recently it has been logging people out, then crashing.
Here's error code:
[13:47:48 ERROR]: Please report this to http://www.spigotmc.org/
[13:47:48 ERROR]: Be sure to include ALL relevant console errors and Minecraft crash reports
[13:47:48 ERROR]: Spigot version: git-Spigot-1487 (MC: 1.7.9)
[13:47:48 ERROR]: ------------------------------
[13:47:48 ERROR]: Server thread dump (Look for plugins here before reporting to Spigot!):
[13:47:53 ERROR]: ------------------------------
[13:47:53 ERROR]: Current Thread: Server thread
[13:47:53 ERROR]ID: 13 | Suspended: false | Native: true | State: RUNNABLE
[13:47:53 ERROR]:Stack:
[13:47:53 ERROR]:java.io.RandomAccessFile.read0(Native Method)
[13:47:53 ERROR]:java.io.RandomAccessFile.read(RandomAccessFile.java:330)
[13:47:53 ERROR]:java.io.RandomAccessFile.readInt(RandomAccessFile.java:822)
[13:47:53 ERROR]:net.minecraft.server.v1_7_R3.RegionFile.chunkExists(RegionFile.java:109)
[13:47:53 ERROR]:net.minecraft.server.v1_7_R3.ChunkRegionLoader.chunkExists(ChunkRegionLoader.java:41)
[13:47:53 ERROR]:net.minecraft.server.v1_7_R3.ChunkProviderServer.getChunkAt(ChunkProviderServer.java:111)
[13:47:53 ERROR]:net.minecraft.server.v1_7_R3.PlayerChunk.<init>(PlayerChunk.java:35)
[13:47:53 ERROR]:net.minecraft.server.v1_7_R3.PlayerChunkMap.a(PlayerChunkMap.java:91)
[13:47:53 ERROR]:net.minecraft.server.v1_7_R3.PlayerChunkMap.addPlayer(PlayerChunkMap.java:135)
[13:47:53 ERROR]:net.minecraft.server.v1_7_R3.PlayerList.moveToWorld(PlayerList.java:548)
[13:47:53 ERROR]rg.bukkit.craftbukkit.v1_7_R3.entity.CraftPlayer.teleport(CraftPlayer.java:503)
[13:47:53 ERROR]:com.earth2me.essentials.Teleport.now(Teleport.java:126)
[13:47:53 ERROR]:com.earth2me.essentials.Teleport.teleport(Teleport.java:194)
[13:47:53 ERROR]:com.earth2me.essentials.Teleport.teleportPlayer(Teleport.java:158)
[13:47:53 ERROR]:com.earth2me.essentials.spawn.Commandspawn.respawn(Commandspawn.java:68)
[13:47:53 ERROR]:com.earth2me.essentials.spawn.Commandspawn.run(Commandspawn.java:39)
[13:47:53 ERROR]:com.earth2me.essentials.commands.EssentialsCommand.run(EssentialsCommand.java:149)
[13:47:53 ERROR]:com.earth2me.essentials.Essentials.onCommandEssentials(Essentials.java:505)
[13:47:53 ERROR]:com.earth2me.essentials.spawn.EssentialsSpawn.onCommand(EssentialsSpawn.java:72)
[13:47:53 ERROR]rg.bukkit.command.PluginCommand.execute(PluginCommand.java:44)
[13:47:53 ERROR]rg.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:180)
[13:47:53 ERROR]rg.bukkit.craftbukkit.v1_7_R3.CraftServer.dispatchCommand(CraftServer.java:726)
[13:47:53 ERROR]:net.minecraft.server.v1_7_R3.PlayerConnection.handleCommand(PlayerConnection.java:999)
[13:47:53 ERROR]:net.minecraft.server.v1_7_R3.PlayerConnection.a(PlayerConnection.java:830)
[13:47:53 ERROR]:net.minecraft.server.v1_7_R3.PacketPlayInChat.a(PacketPlayInChat.java:28)
[13:47:53 ERROR]:net.minecraft.server.v1_7_R3.PacketPlayInChat.handle(PacketPlayInChat.java:65)
[13:47:53 ERROR]:net.minecraft.server.v1_7_R3.NetworkManager.a(NetworkManager.java:180)
[13:47:53 ERROR]:net.minecraft.server.v1_7_R3.ServerConnection.c(ServerConnection.java:81)
[13:47:53 ERROR]:net.minecraft.server.v1_7_R3.MinecraftServer.v(MinecraftServer.java:720)
[13:47:53 ERROR]:net.minecraft.server.v1_7_R3.DedicatedServer.v(DedicatedServer.java:283)
[13:47:53 ERROR]:net.minecraft.server.v1_7_R3.MinecraftServer.u(MinecraftServer.java:583)
[13:47:53 ERROR]:net.minecraft.server.v1_7_R3.MinecraftServer.run(MinecraftServer.java:489)
[13:47:53 ERROR]:net.minecraft.server.v1_7_R3.ThreadServerApplication.run(SourceFile:628)
[13:47:53 ERROR]: ------------------------------
[13:47:53 ERROR]: Entire Thread Dump:
[13:47:55 ERROR]: ------------------------------
[13:47:57 ERROR]: ------------------------------
[13:47:57 ERROR]: Current Thread: Server console handler
[13:47:57 ERROR]ID: 16 | Suspended: false | Native: true | State: RUNNABLE
[13:47:57 ERROR]:Thread is waiting on monitor(s):
[13:47:57 ERROR]:Locked on:java.io.BufferedInputStream.read(BufferedInputStream.java:254)
[13:47:57 ERROR]:Locked onrg.bukkit.craftbukkit.libs.jline.internal.InputStreamReader.read(InputStreamReader.java:267)
[13:47:57 ERROR]:Locked onrg.bukkit.craftbukkit.libs.jline.internal.InputStreamReader.read(InputStreamReader.java:204)
[13:47:57 ERROR]:Stack:
[13:47:57 ERROR]:java.io.FileInputStream.readBytes(Native Method)
[13:47:57 ERROR]:java.io.FileInputStream.read(FileInputStream.java:272)
[13:47:57 ERROR]:java.io.BufferedInputStream.fill(BufferedInputStream.java:235)
[13:47:57 ERROR]:java.io.BufferedInputStream.read(BufferedInputStream.java:254)
[13:47:57 ERROR]:java.io.FilterInputStream.read(FilterInputStream.java:83)
[13:47:57 ERROR]rg.bukkit.craftbukkit.libs.jline.console.ConsoleReader$1.read(ConsoleReader.java:167)
[13:47:57 ERROR]rg.bukkit.craftbukkit.libs.jline.internal.InputStreamReader.read(InputStreamReader.java:267)
[13:47:57 ERROR]rg.bukkit.craftbukkit.libs.jline.internal.InputStreamReader.read(InputStreamReader.java:204)
[13:47:57 ERROR]rg.bukkit.craftbukkit.libs.jline.console.ConsoleReader.readCharacter(ConsoleReader.java:995)
[13:47:57 ERROR]rg.bukkit.craftbukkit.libs.jline.console.ConsoleReader.readLine(ConsoleReader.java:1167)
[13:47:57 ERROR]:net.minecraft.server.v1_7_R3.ThreadCommandReader.run(ThreadCommandReader.java:32)
[13:47:57 ERROR]: ------------------------------
[13:47:57 ERROR]: Current Thread: DestroyJavaVM
[13:47:57 ERROR]ID: 15 | Suspended: false | Native: false | State: RUNNABLE
[13:47:57 ERROR]:Stack:
[13:47:57 ERROR]: ------------------------------
[13:47:57 ERROR]: Current Thread: Server thread
[13:47:57 ERROR]ID: 13 | Suspended: false | Native: false | State: RUNNABLE
[13:47:57 ERROR]:Thread is waiting on monitor(s):
[13:47:57 ERROR]:Locked on:net.minecraft.server.v1_7_R3.RegionFile.chunkExists(RegionFile.java:109)
[13:47:57 ERROR]:Locked on:net.minecraft.server.v1_7_R3.ServerConnection.c(ServerConnection.java:81)
[13:47:57 ERROR]:Stack:
[13:47:57 ERROR]:java.io.RandomAccessFile.read0(Native Method)
[13:47:58 ERROR]:java.io.RandomAccessFile.read(RandomAccessFile.java:330)
[13:47:58 ERROR]:java.io.RandomAccessFile.readInt(RandomAccessFile.java:822)
[13:47:58 ERROR]:net.minecraft.server.v1_7_R3.RegionFile.chunkExists(RegionFile.java:109)
[13:47:58 ERROR]:net.minecraft.server.v1_7_R3.ChunkRegionLoader.chunkExists(ChunkRegionLoader.java:41)
[13:47:58 ERROR]:net.minecraft.server.v1_7_R3.ChunkProviderServer.getChunkAt(ChunkProviderServer.java:111)
[13:47:58 ERROR]:net.minecraft.server.v1_7_R3.PlayerChunk.<init>(PlayerChunk.java:35)
[13:47:58 ERROR]:net.minecraft.server.v1_7_R3.PlayerChunkMap.a(PlayerChunkMap.java:91)
[13:47:58 ERROR]:net.minecraft.server.v1_7_R3.PlayerChunkMap.addPlayer(PlayerChunkMap.java:135)
[13:47:58 ERROR]:net.minecraft.server.v1_7_R3.PlayerList.moveToWorld(PlayerList.java:548)
[13:47:58 ERROR]rg.bukkit.craftbukkit.v1_7_R3.entity.CraftPlayer.teleport(CraftPlayer.java:503)
[13:47:58 ERROR]:com.earth2me.essentials.Teleport.now(Teleport.java:126)
[13:47:58 ERROR]:com.earth2me.essentials.Teleport.teleport(Teleport.java:194)
[13:47:58 ERROR]:com.earth2me.essentials.Teleport.teleportPlayer(Teleport.java:158)
[13:47:58 ERROR]:com.earth2me.essentials.spawn.Commandspawn.respawn(Commandspawn.java:68)
[13:47:58 ERROR]:com.earth2me.essentials.spawn.Commandspawn.run(Commandspawn.java:39)
[13:47:58 ERROR]:com.earth2me.essentials.commands.EssentialsCommand.run(EssentialsCommand.java:149)
[13:47:58 ERROR]:com.earth2me.essentials.Essentials.onCommandEssentials(Essentials.java:505)
[13:47:58 ERROR]:com.earth2me.essentials.spawn.EssentialsSpawn.onCommand(EssentialsSpawn.java:72)
[13:47:58 ERROR]rg.bukkit.command.PluginCommand.execute(PluginCommand.java:44)
[13:47:58 ERROR]rg.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:180)
[13:47:58 ERROR]rg.bukkit.craftbukkit.v1_7_R3.CraftServer.dispatchCommand(CraftServer.java:726)

 

You are not running our software, we cannot provide you support. Seek support where you acquired your server.