Error for /http-bind/ Explain, please

Openfire 3.6.0a via http-bind

Sometimes I see the following messages in the warn.log

Can anybody explain me the reason?

2008.10.08 14:59:56 Error for /http-bind/
java.lang.InternalError: Could not locate connection: 887998
at org.jivesoftware.openfire.http.HttpSession.getResponse(HttpSession.java:558)
at org.jivesoftware.openfire.http.HttpBindServlet.handleSessionRequest(HttpBindSer vlet.java:268)
at org.jivesoftware.openfire.http.HttpBindServlet.parseDocument(HttpBindServlet.ja va:151)
at org.jivesoftware.openfire.http.HttpBindServlet.doPost(HttpBindServlet.java:120)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:362)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:726)
at org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollect ion.java:206)
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:324)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:505)
at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:843 )
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:648)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:380)
at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:395)
at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:488)

I don’t believe that nobody knows the nature of this error

Somebody has programmed the exception, isn’t it?