Probleme serveur minecraft

voici mon crash report : Minecraft Crash Report ----
// On the bright side, I bought you a teddy bear!

Time: 14-12-27 18:14
Description: Watching Server

java.lang.Error
at aqr.i(SourceFile:1275)
at qu.i(SourceFile:478)
at net.minecraft.server.MinecraftServer.A(SourceFile:608)
at pp.A(SourceFile:299)
at net.minecraft.server.MinecraftServer.z(SourceFile:532)
at net.minecraft.server.MinecraftServer.run(SourceFile:448)
at java.lang.Thread.run(Unknown Source)

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

-- Head --
Stacktrace:
at aqr.i(SourceFile:1275)
at qu.i(SourceFile:478)
at net.minecraft.server.MinecraftServer.A(SourceFile:608)
at pp.A(SourceFile:299)
at net.minecraft.server.MinecraftServer.z(SourceFile:532)

-- Thread Dump --
Details:
Threads: "Netty Server IO #2" Id=28 RUNNABLE (in native)
at sun.nio.ch.WindowsSelectorImpl$SubSelector.poll0(Native Method)
at sun.nio.ch.WindowsSelectorImpl$SubSelector.poll(Unknown Source)
at sun.nio.ch.WindowsSelectorImpl$SubSelector.access$400(Unknown Source)
at sun.nio.ch.WindowsSelectorImpl.doSelect(Unknown Source)
at sun.nio.ch.SelectorImpl.lockAndDoSelect(Unknown Source)
- locked io.netty.channel.nio.SelectedSelectionKeySet@1138a70
- locked java.util.Collections$UnmodifiableSet@1d46ba2
- locked sun.nio.ch.WindowsSelectorImpl@1ebe100
at sun.nio.ch.SelectorImpl.select(Unknown Source)
at io.netty.channel.nio.NioEventLoop.select(NioEventLoop.java:622)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:310)
...

"Netty Server IO #1" Id=27 RUNNABLE (in native)
at sun.nio.ch.WindowsSelectorImpl$SubSelector.poll0(Native Method)
at sun.nio.ch.WindowsSelectorImpl$SubSelector.poll(Unknown Source)
at sun.nio.ch.WindowsSelectorImpl$SubSelector.access$400(Unknown Source)
at sun.nio.ch.WindowsSelectorImpl.doSelect(Unknown Source)
at sun.nio.ch.SelectorImpl.lockAndDoSelect(Unknown Source)
- locked io.netty.channel.nio.SelectedSelectionKeySet@e96199
- locked java.util.Collections$UnmodifiableSet@1c82dbe
- locked sun.nio.ch.WindowsSelectorImpl@191d51e
at sun.nio.ch.SelectorImpl.select(Unknown Source)
at io.netty.channel.nio.NioEventLoop.select(NioEventLoop.java:622)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:310)
...

"File IO Thread" Id=33 RUNNABLE
at java.util.zip.Deflater.deflateBytes(Native Method)
at java.util.zip.Deflater.deflate(Unknown Source)
- locked java.util.zip.ZStreamRef@15ac78d
at java.util.zip.Deflater.deflate(Unknown Source)
at java.util.zip.DeflaterOutputStream.deflate(Unknown Source)
at java.util.zip.DeflaterOutputStream.write(Unknown Source)
at java.util.zip.DeflaterOutputStream.write(Unknown Source)
at java.io.DataOutputStream.writeInt(Unknown Source)
at ft.a(SourceFile:22)
...

"Server Watchdog" Id=31 RUNNABLE
at sun.management.ThreadImpl.dumpThreads0(Native Method)
at sun.management.ThreadImpl.dumpAllThreads(Unknown Source)
at pu.run(SourceFile:43)
at java.lang.Thread.run(Unknown Source)

"Netty Server IO #0" Id=26 RUNNABLE (in native)
at sun.nio.ch.WindowsSelectorImpl$SubSelector.poll0(Native Method)
at sun.nio.ch.WindowsSelectorImpl$SubSelector.poll(Unknown Source)
at sun.nio.ch.WindowsSelectorImpl$SubSelector.access$400(Unknown Source)
at sun.nio.ch.WindowsSelectorImpl.doSelect(Unknown Source)
at sun.nio.ch.SelectorImpl.lockAndDoSelect(Unknown Source)
- locked io.netty.channel.nio.SelectedSelectionKeySet@c69ed6
- locked java.util.Collections$UnmodifiableSet@71fced
- locked sun.nio.ch.WindowsSelectorImpl@145f8d8
at sun.nio.ch.SelectorImpl.select(Unknown Source)
at io.netty.channel.nio.NioEventLoop.select(NioEventLoop.java:622)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:310)
...

"D3D Screen Updater" Id=24 TIMED_WAITING on java.lang.Object@5e2852
at java.lang.Object.wait(Native Method)
- waiting on java.lang.Object@5e2852
at sun.java2d.d3d.D3DScreenUpdateManager.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

"DestroyJavaVM" Id=22 RUNNABLE

"Server thread" Id=20 RUNNABLE
at aqr.i(SourceFile:1275)
at qu.i(SourceFile:478)
at net.minecraft.server.MinecraftServer.A(SourceFile:608)
at pp.A(SourceFile:299)
at net.minecraft.server.MinecraftServer.z(SourceFile:532)
at net.minecraft.server.MinecraftServer.run(SourceFile:448)
at java.lang.Thread.run(Unknown Source)

"TimerQueue" Id=18 TIMED_WAITING on java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject@1512809
at sun.misc.Unsafe.park(Native Method)
- waiting on java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject@1512809
at java.util.concurrent.locks.LockSupport.parkNanos(Unknown Source)
at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(Unknown Source)
at java.util.concurrent.DelayQueue.take(Unknown Source)
at javax.swing.TimerQueue.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

Number of locked synchronizers = 1
- java.util.concurrent.locks.ReentrantLock$NonfairSync@8820a1

"AWT-EventQueue-0" Id=16 RUNNABLE
at java.lang.Runtime.gc(Native Method)
at java.lang.System.gc(Unknown Source)
at qe.a(SourceFile:36)
at qe.a(SourceFile:11)
at qf.actionPerformed(SourceFile:28)
at javax.swing.Timer.fireActionPerformed(Unknown Source)
at javax.swing.Timer$DoPostEvent.run(Unknown Source)
at java.awt.event.InvocationEvent.dispatch(Unknown Source)
...

"AWT-Windows" Id=14 RUNNABLE (in native)
at sun.awt.windows.WToolkit.eventLoop(Native Method)
at sun.awt.windows.WToolkit.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

"AWT-Shutdown" Id=13 WAITING on java.lang.Object@13090c3
at java.lang.Object.wait(Native Method)
- waiting on java.lang.Object@13090c3
at java.lang.Object.wait(Unknown Source)
at sun.awt.AWTAutoShutdown.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

"Java2D Disposer" Id=12 WAITING on java.lang.ref.ReferenceQueue$Lock@6d2b4f
at java.lang.Object.wait(Native Method)
- waiting on java.lang.ref.ReferenceQueue$Lock@6d2b4f
at java.lang.ref.ReferenceQueue.remove(Unknown Source)
at java.lang.ref.ReferenceQueue.remove(Unknown Source)
at sun.java2d.Disposer.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

"Server Infinisleeper" Id=11 TIMED_WAITING
at java.lang.Thread.sleep(Native Method)
at pq.run(SourceFile:65)

"Snooper Timer" Id=10 TIMED_WAITING on java.util.TaskQueue@1f7998b
at java.lang.Object.wait(Native Method)
- waiting on java.util.TaskQueue@1f7998b
at java.util.TimerThread.mainLoop(Unknown Source)
at java.util.TimerThread.run(Unknown Source)

"Attach Listener" Id=5 RUNNABLE

"Signal Dispatcher" Id=4 RUNNABLE

"Finalizer" Id=3 BLOCKED on java.lang.ref.ReferenceQueue$Lock@176fd5c owned by "Reference Handler" Id=2
at java.lang.Object.wait(Native Method)
- blocked on java.lang.ref.ReferenceQueue$Lock@176fd5c
at java.lang.ref.ReferenceQueue.remove(Unknown Source)
at java.lang.ref.ReferenceQueue.remove(Unknown Source)
at java.lang.ref.Finalizer$FinalizerThread.run(Unknown Source)

"Reference Handler" Id=2 RUNNABLE
at java.lang.Object.notifyAll(Native Method)
at java.lang.ref.ReferenceQueue.enqueue(Unknown Source)
- locked java.lang.ref.ReferenceQueue$Lock@176fd5c
at java.lang.ref.Reference$ReferenceHandler.run(Unknown Source)

Stacktrace:
at pu.run(SourceFile:59)
at java.lang.Thread.run(Unknown Source)

-- System Details --
Details:
Minecraft Version: 1.8.1
Operating System: Windows 7 (x86) version 6.1
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 408033160 bytes (389 MB) / 519110656 bytes (495 MB) up to 1037959168 bytes (989 MB)
JVM Flags: 2 total; -Xms512m -Xmx1024m
IntCache: cache: 1, tcache: 1, allocated: 12, tallocated: 94
Profiler Position: N/A (disabled)
Player Count: 0 / 20; []
Is Modded: Unknown (can't tell)
Type: Dedicated Server (map_server.txt)