1.7.2 Bukkit Server Crash Report, I need Help!

Hello, I installed some plugins and tryed to start my server and i get thie crash report.
Can someone please help me? I want to start my server.

Crash Report:
---- Minecraft Crash Report ----
// Don't do that.

Time: 2013-12-12 16:03
Description: Exception in server tick loop

java.lang.RuntimeException: Failed to check session lock, aborting
at net.minecraft.server.v1_7_R1.WorldNBTStorage.h(WorldNBTStorage.java:57)
at net.minecraft.server.v1_7_R1.WorldNBTStorage.<init>(WorldNBTStorage.java:42)
at net.minecraft.server.v1_7_R1.ServerNBTManager.<init>(SourceFile:16)
at net.minecraft.server.v1_7_R1.MinecraftServer.a(MinecraftServer.java:210)
at net.minecraft.server.v1_7_R1.DedicatedServer.init(DedicatedServer.java:175)
at net.minecraft.server.v1_7_R1.MinecraftServer.run(MinecraftServer.java:420)
at net.minecraft.server.v1_7_R1.ThreadServerApplication.run(SourceFile:617)


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

-- System Details --
Details:
Minecraft Version: 1.7.2
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.7.0_17, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 3729459416 bytes (3556 MB) / 4116054016 bytes (3925 MB) up to 4116054016 bytes (3925 MB)
JVM Flags: 2 total; -Xms4096M -Xmx4096M
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
CraftBukkit Information:
Running: CraftBukkit version git-Bukkit-1.6.4-R2.0-38-g4b4e2cc-b2953jnks (MC: 1.7.2) (Implementing API version 1.7.2-R0.1-SNAPSHOT) true
Plugins: { Hub v0.1 me.dulexzach.spawnleave.spawnleave [], WorldEdit v5.5.8 com.sk89q.worldedit.bukkit.WorldEditPlugin [], Multiverse-Core v2.4-b527 com.onarandombox.MultiverseCore.MultiverseCore [Rigby, fernferret, lithium3141, main--], Multiverse-Portals v2.4-b548 com.onarandombox.MultiversePortals.MultiversePortals [Rigby, fernferret], Essentials v2.12.2 com.earth2me.essentials.Essentials [Zenexer, ementalo, Aelux, Brettflan, KimKandor, snowleo, ceulemans, Xeology, KHobbits, md_5, Iaccidentally], EssentialsSpawn v2.12.2 com.earth2me.essentials.spawn.EssentialsSpawn [Zenexer, ementalo, Aelux, Brettflan, KimKandor, snowleo, ceulemans, Xeology, KHobbits],}
Warnings: DEFAULT
Threads: { RUNNABLE DestroyJavaVM: [], TIMED_WAITING Keep-Alive-Timer: [java.lang.Thread.sleep(Native Method), sun.net.www.http.KeepAliveCache.run(Unknown Source), java.lang.Thread.run(Unknown Source)], 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 Signal Dispatcher: [], RUNNABLE Server thread: [java.lang.Thread.dumpThreads(Native Method), java.lang.Thread.getAllStackTraces(Unknown Source), org.bukkit.craftbukkit.v1_7_R1.CraftCrashReport.call(CraftCrashReport.java:28), net.minecraft.server.v1_7_R1.CrashReportSystemDetails.a(SourceFile:74), net.minecraft.server.v1_7_R1.CrashReport.h(CrashReport.java:45), net.minecraft.server.v1_7_R1.CrashReport.<init>(CrashReport.java:33), net.minecraft.server.v1_7_R1.MinecraftServer.run(MinecraftServer.java:470), net.minecraft.server.v1_7_R1.ThreadServerApplication.run(SourceFile:617)], RUNNABLE Attach Listener: [], RUNNABLE Server console handler: [org.fusesource.jansi.internal.Kernel32._getch(Native Method), org.fusesource.jansi.internal.WindowsSupport.readByte(WindowsSupport.java:46), org.bukkit.craftbukkit.libs.jline.WindowsTerminal.readByte(WindowsTerminal.java:184), org.bukkit.craftbukkit.libs.jline.WindowsTerminal.access$000(WindowsTerminal.java:53), org.bukkit.craftbukkit.libs.jline.WindowsTerminal$1.read(WindowsTerminal.java:151), java.io.FilterInputStream.read(Unknown Source), org.bukkit.craftbukkit.libs.jline.console.ConsoleReader$1.read(ConsoleReader.java:167), org.bukkit.craftbukkit.libs.jline.internal.InputStreamReader.read(InputStreamReader.java:267), org.bukkit.craftbukkit.libs.jline.internal.InputStreamReader.read(InputStreamReader.java:204), org.bukkit.craftbukkit.libs.jline.console.ConsoleReader.readCharacter(ConsoleReader.java:995), org.bukkit.craftbukkit.libs.jline.console.ConsoleReader.readLine(ConsoleReader.java:1167), net.minecraft.server.v1_7_R1.ThreadCommandReader.run(ThreadCommandReader.java:32)], RUNNABLE Thread-7: [java.net.SocketInputStream.socketRead0(Native Method), java.net.SocketInputStream.read(Unknown Source), java.net.SocketInputStream.read(Unknown Source), java.io.BufferedInputStream.fill(Unknown Source), java.io.BufferedInputStream.read1(Unknown Source), java.io.BufferedInputStream.read(Unknown Source), sun.net.www.http.HttpClient.parseHTTPHeader(Unknown Source), sun.net.www.http.HttpClient.parseHTTP(Unknown Source), sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source), org.bukkit.craftbukkit.v1_7_R1.updater.BukkitDLUpdaterService.fetchChannel(BukkitDLUpdaterService.java:80), org.bukkit.craftbukkit.v1_7_R1.updater.BukkitDLUpdaterService.getChannel(BukkitDLUpdaterService.java:63), org.bukkit.craftbukkit.v1_7_R1.updater.AutoUpdater$1.run(AutoUpdater.java:113)], WAITING Reference Handler: [java.lang.Object.wait(Native Method), java.lang.Object.wait(Object.java:503), java.lang.ref.Reference$ReferenceHandler.run(Unknown Source)], RUNNABLE Thread-5: [java.io.FileOutputStream.writeBytes(Native Method), java.io.FileOutputStream.write(Unknown Source), java.io.BufferedOutputStream.flushBuffer(Unknown Source), java.io.BufferedOutputStream.flush(Unknown Source), java.io.PrintStream.write(Unknown Source), org.fusesource.jansi.AnsiOutputStream.write(AnsiOutputStream.java:82), java.io.FilterOutputStream.write(Unknown Source), java.io.PrintStream.write(Unknown Source), java.io.FilterOutputStream.write(Unknown Source), org.bukkit.craftbukkit.v1_7_R1.util.TerminalConsoleWriterThread.run(TerminalConsoleWriterThread.java:34), java.lang.Thread.run(Unknown Source)], RUNNABLE Netty IO #0: [sun.nio.ch.WindowsSelectorImpl$SubSelector.poll0(Native Method), sun.nio.ch.WindowsSelectorImpl$SubSelector.poll(Unknown Source), sun.nio.ch.WindowsSelectorImpl$SubSelector.access$400(Unknown Source), sun.nio.ch.WindowsSelectorImpl.doSelect(Unknown Source), sun.nio.ch.SelectorImpl.lockAndDoSelect(Unknown Source), sun.nio.ch.SelectorImpl.select(Unknown Source), net.minecraft.util.io.netty.channel.nio.NioEventLoop.select(NioEventLoop.java:591), net.minecraft.util.io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:301), net.minecraft.util.io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:101), 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)], TIMED_WAITING Server Infinisleeper: [java.lang.Thread.sleep(Native Method), net.minecraft.server.v1_7_R1.ThreadSleepForever.run(SourceFile:62)],}
Recent tasks from -31--1{}
Profiler Position: N/A (disabled)
Player Count: 0 / 4; []
Is Modded: Definitely; Server brand changed to 'craftbukkit'
Type: Dedicated Server (map_server.txt)