solr error

gistfile1.txt

May 31, 2012 3:30:22 PM org.apache.solr.common.SolrException log
SEVERE: org.apache.lucene.store.LockObtainFailedException: Lock obtain timed out: SimpleFSLock@/home/entretenerse/src/apache-solr-3.6.0/example
/data/index/write.lock
        at org.apache.lucene.store.Lock.obtain(Lock.java:84)
        at org.apache.lucene.index.IndexWriter.<init>(IndexWriter.java:1098)
        at org.apache.solr.update.SolrIndexWriter.<init>(SolrIndexWriter.java:84)
        at org.apache.solr.update.UpdateHandler.createMainIndexWriter(UpdateHandler.java:101)
        at org.apache.solr.update.DirectUpdateHandler2.openWriter(DirectUpdateHandler2.java:171)
        at org.apache.solr.update.DirectUpdateHandler2.delete(DirectUpdateHandler2.java:286)
        at org.apache.solr.update.processor.RunUpdateProcessor.processDelete(RunUpdateProcessorFactory.java:68)
        at org.apache.solr.update.processor.LogUpdateProcessor.processDelete(LogUpdateProcessorFactory.java:137)
        at org.apache.solr.handler.XMLLoader.processDelete(XMLLoader.java:270)
        at org.apache.solr.handler.XMLLoader.processUpdate(XMLLoader.java:201)
        at org.apache.solr.handler.XMLLoader.load(XMLLoader.java:79)
        at org.apache.solr.handler.ContentStreamHandlerBase.handleRequestBody(ContentStreamHandlerBase.java:58)
        at org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:129)
        at org.apache.solr.core.SolrCore.execute(SolrCore.java:1376)
        at org.apache.solr.servlet.SolrDispatchFilter.execute(SolrDispatchFilter.java:365)
        at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:260)
        at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212)
        at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:399)
        at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
        at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
        at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:766)
        at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:450)
        at org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:230)
        at org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)
        at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
        at org.mortbay.jetty.Server.handle(Server.java:326)
        at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
        at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:945)
        at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:756)
        at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:218)
        at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
        at org.mortbay.jetty.bio.SocketConnector$Connection.run(SocketConnector.java:228)
        at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)