An exception was thrown when stop service

Hello,
I get an exception when stop service.This is log detail:

[2014-09-15 10:05:02,910][WARN ][netty.channel.DefaultChannelPipeline] An
exception was thrown by an exception handler.
java.util.concurrent.RejectedExecutionException: Worker has already been
shutdown
at
org.elasticsearch.common.netty.channel.socket.nio.AbstractNioSelector.registerTask(AbstractNioSelector.java:120)
at
org.elasticsearch.common.netty.channel.socket.nio.AbstractNioWorker.executeInIoThread(AbstractNioWorker.java:72)
at
org.elasticsearch.common.netty.channel.socket.nio.NioWorker.executeInIoThread(NioWorker.java:36)
at
org.elasticsearch.common.netty.channel.socket.nio.AbstractNioWorker.executeInIoThread(AbstractNioWorker.java:56)
at
org.elasticsearch.common.netty.channel.socket.nio.NioWorker.executeInIoThread(NioWorker.java:36)
at
org.elasticsearch.common.netty.channel.socket.nio.AbstractNioChannelSink.execute(AbstractNioChannelSink.java:34)
at
org.elasticsearch.common.netty.channel.DefaultChannelPipeline.execute(DefaultChannelPipeline.java:636)
at
org.elasticsearch.common.netty.channel.Channels.fireExceptionCaughtLater(Channels.java:496)
at
org.elasticsearch.common.netty.channel.AbstractChannelSink.exceptionCaught(AbstractChannelSink.java:46)
at
org.elasticsearch.common.netty.channel.DefaultChannelPipeline.notifyHandlerException(DefaultChannelPipeline.java:658)
at
org.elasticsearch.common.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendDownstream(DefaultChannelPipeline.java:781)
at org.elasticsearch.common.netty.channel.Channels.write(Channels.java:725)
at
org.elasticsearch.common.netty.handler.codec.oneone.OneToOneEncoder.doEncode(OneToOneEncoder.java:71)
at
org.elasticsearch.common.netty.handler.codec.oneone.OneToOneEncoder.handleDownstream(OneToOneEncoder.java:59)
at
org.elasticsearch.common.netty.channel.DefaultChannelPipeline.sendDownstream(DefaultChannelPipeline.java:591)
at
org.elasticsearch.common.netty.channel.DefaultChannelPipeline.sendDownstream(DefaultChannelPipeline.java:582)
at org.elasticsearch.common.netty.channel.Channels.write(Channels.java:704)
at org.elasticsearch.common.netty.channel.Channels.write(Channels.java:671)
at
org.elasticsearch.common.netty.channel.AbstractChannel.write(AbstractChannel.java:248)
at
org.elasticsearch.http.netty.NettyHttpChannel.sendResponse(NettyHttpChannel.java:158)
at
org.elasticsearch.rest.action.admin.cluster.node.stats.RestNodesStatsAction$1.onResponse(RestNodesStatsAction.java:122)
at
org.elasticsearch.rest.action.admin.cluster.node.stats.RestNodesStatsAction$1.onResponse(RestNodesStatsAction.java:114)
at
org.elasticsearch.action.support.nodes.TransportNodesOperationAction$AsyncAction.finishHim(TransportNodesOperationAction.java:227)
at
org.elasticsearch.action.support.nodes.TransportNodesOperationAction$AsyncAction.onOperation(TransportNodesOperationAction.java:202)
at
org.elasticsearch.action.support.nodes.TransportNodesOperationAction$AsyncAction.access$900(TransportNodesOperationAction.java:102)
at
org.elasticsearch.action.support.nodes.TransportNodesOperationAction$AsyncAction$4.handleResponse(TransportNodesOperationAction.java:178)
at
org.elasticsearch.action.support.nodes.TransportNodesOperationAction$AsyncAction$4.handleResponse(TransportNodesOperationAction.java:170)
at
org.elasticsearch.transport.netty.MessageChannelHandler.handleResponse(MessageChannelHandler.java:154)
at
org.elasticsearch.transport.netty.MessageChannelHandler.messageReceived(MessageChannelHandler.java:125)
at
org.elasticsearch.common.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:70)
at
org.elasticsearch.common.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)
at
org.elasticsearch.common.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:791)
at
org.elasticsearch.common.netty.channel.Channels.fireMessageReceived(Channels.java:296)
at
org.elasticsearch.common.netty.handler.codec.frame.FrameDecoder.unfoldAndFireMessageReceived(FrameDecoder.java:462)
at
org.elasticsearch.common.netty.handler.codec.frame.FrameDecoder.callDecode(FrameDecoder.java:443)
at
org.elasticsearch.common.netty.handler.codec.frame.FrameDecoder.messageReceived(FrameDecoder.java:310)
at
org.elasticsearch.common.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:70)
at
org.elasticsearch.common.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)
at
org.elasticsearch.common.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:559)
at
org.elasticsearch.common.netty.channel.Channels.fireMessageReceived(Channels.java:268)
at
org.elasticsearch.common.netty.channel.Channels.fireMessageReceived(Channels.java:255)
at
org.elasticsearch.common.netty.channel.socket.nio.NioWorker.read(NioWorker.java:88)
at
org.elasticsearch.common.netty.channel.socket.nio.AbstractNioWorker.process(AbstractNioWorker.java:108)
at
org.elasticsearch.common.netty.channel.socket.nio.AbstractNioSelector.run(AbstractNioSelector.java:318)
at
org.elasticsearch.common.netty.channel.socket.nio.AbstractNioWorker.run(AbstractNioWorker.java:89)
at
org.elasticsearch.common.netty.channel.socket.nio.NioWorker.run(NioWorker.java:178)
at
org.elasticsearch.common.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:108)
at
org.elasticsearch.common.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:42)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:722)

version:elasticsearch-1.1.1
java version:jdk1.7.0_11
os:windows server 2003 standard edition sp2

what's wrong?

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