Bukkit Crash

Hello! I'm having some problems with my server, if someone could look at this crash log, it would be greatly appreciated!

Code:

---- Minecraft Crash Report ----
// This is a token for 1 free hug. Redeem at your nearest Mojangsta: [~~HUG~~]

Time: 3/30/15 3:50 PM
Description: Exception in server tick loop

java.lang.NullPointerException: Exception in server tick loop
    at net.minecraft.server.v1_8_R1.JsonList.load(JsonList.java:174)
    at net.minecraft.server.v1_8_R1.DedicatedPlayerList.z(SourceFile:99)
    at net.minecraft.server.v1_8_R1.DedicatedPlayerList.<init>(SourceFile:25)
    at net.minecraft.server.v1_8_R1.DedicatedServer.init(DedicatedServer.java:130)
    at net.minecraft.server.v1_8_R1.MinecraftServer.run(MinecraftServer.java:505)
    at java.lang.Thread.run(Unknown Source)


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- System Details --
Details:
    Minecraft Version: 1.8
    Operating System: Linux (amd64) version 2.6.32-504.3.3.el6.x86_64
    Java Version: 1.7.0_72, Oracle Corporation
    Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
    Memory: 924410440 bytes (881 MB) / 1037959168 bytes (989 MB) up to 1037959168 bytes (989 MB)
    JVM Flags: 5 total; -Xmx1024M -Xms1024M -XX:+UseConcMarkSweepGC -XX:+CMSClassUnloadingEnabled -XX:MaxPermSize=128M
    IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
    CraftBukkit Information:
   Running: CraftBukkit version git-Spigot-c3c767f-33d5de3 (MC: 1.8) (Implementing API version 1.8-R0.1-SNAPSHOT) true
   Plugins: {}
   Warnings: DEFAULT
   Reload Count: 0
   Threads: { RUNNABLE Signal Dispatcher: [], RUNNABLE Server thread: [java.lang.Thread.dumpThreads(Native Method), java.lang.Thread.getAllStackTraces(Unknown Source), org.bukkit.craftbukkit.v1_8_R1.CraftCrashReport.call(CraftCrashReport.java:29), net.minecraft.server.v1_8_R1.CrashReportSystemDetails.a(SourceFile:78), net.minecraft.server.v1_8_R1.CrashReport.h(CrashReport.java:43), net.minecraft.server.v1_8_R1.CrashReport.<init>(CrashReport.java:32), net.minecraft.server.v1_8_R1.MinecraftServer.run(MinecraftServer.java:557), java.lang.Thread.run(Unknown Source)], WAITING Thread-4: [sun.misc.Unsafe.park(Native Method), java.util.concurrent.locks.LockSupport.park(Unknown Source), java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(Unknown Source), java.util.concurrent.LinkedBlockingQueue.take(Unknown Source), com.mojang.util.QueueLogAppender.getNextLogEvent(QueueLogAppender.java:77), org.bukkit.craftbukkit.v1_8_R1.util.TerminalConsoleWriterThread.run(TerminalConsoleWriterThread.java:25), java.lang.Thread.run(Unknown Source)], WAITING Snooper Timer: [java.lang.Object.wait(Native Method), java.lang.Object.wait(Object.java:503), java.util.TimerThread.mainLoop(Unknown Source), java.util.TimerThread.run(Unknown Source)], WAITING Reference Handler: [java.lang.Object.wait(Native Method), java.lang.Object.wait(Object.java:503), java.lang.ref.Reference$ReferenceHandler.run(Unknown Source)], TIMED_WAITING Server Infinisleeper: [java.lang.Thread.sleep(Native Method), net.minecraft.server.v1_8_R1.ThreadSleepForever.run(SourceFile:64)], WAITING Finalizer: [java.lang.Object.wait(Native Method), java.lang.ref.ReferenceQueue.remove(Unknown Source), java.lang.ref.ReferenceQueue.remove(Unknown Source), java.lang.ref.Finalizer$FinalizerThread.run(Unknown Source)], RUNNABLE DestroyJavaVM: [], RUNNABLE Server console handler: [java.io.FileInputStream.readBytes(Native Method), java.io.FileInputStream.read(Unknown Source), java.io.BufferedInputStream.fill(Unknown Source), java.io.BufferedInputStream.read(Unknown Source), org.bukkit.craftbukkit.libs.jline.internal.NonBlockingInputStream.read(NonBlockingInputStream.java:248), org.bukkit.craftbukkit.libs.jline.internal.InputStreamReader.read(InputStreamReader.java:261), org.bukkit.craftbukkit.libs.jline.internal.InputStreamReader.read(InputStreamReader.java:198), org.bukkit.craftbukkit.libs.jline.console.ConsoleReader.readCharacter(ConsoleReader.java:2145), org.bukkit.craftbukkit.libs.jline.console.ConsoleReader.readLineSimple(ConsoleReader.java:3183), org.bukkit.craftbukkit.libs.jline.console.ConsoleReader.readLine(ConsoleReader.java:2333), org.bukkit.craftbukkit.libs.jline.console.ConsoleReader.readLine(ConsoleReader.java:2269), org.bukkit.craftbukkit.libs.jline.console.ConsoleReader.readLine(ConsoleReader.java:2257), net.minecraft.server.v1_8_R1.ThreadCommandReader.run(ThreadCommandReader.java:35)],}
   Recent tasks from -31--1{}
    Profiler Position: N/A (disabled)
    Is Modded: Definitely; Server brand changed to 'Spigot'
    Type: Dedicated Server (map_server.txt)

 

Your version is over a month old. I suggest that you update your server, but be aware that means it would be 1.8.3.