I am using XMPP and getting following error when I try
/********************CODE*****************/
Message msg = new MessageBuilder()
                .withRecipientJids(receiverJid)
         .withFromJid(new JID(recipientJid[0].getId()) )
  .withMessageType(MessageType.NORMAL)
                .withBody(msgBody)
                .build();

      SendResponse status =xmpp.sendMessage(msg);

My JID's are correct. msgBody is not null
Problem occures at xmpp.sendMessage(msg);
I don't understand what is null?

/*******************************ERROR
DETAILS************************************/

Uncaught exception from servlet
java.lang.NullPointerException
        at 
com.google.appengine.api.xmpp.XMPPServiceImpl.createMessageRequest(XMPPServiceImpl.java:120)
        at 
com.google.appengine.api.xmpp.XMPPServiceImpl.sendMessage(XMPPServiceImpl.java:105)
        at 
com.ChatRoom.server.XMPPReceiverServlet.doPost(XMPPReceiverServlet.java:165)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:713)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:806)
        at 
org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)
        at 
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1093)
        at 
com.google.apphosting.runtime.jetty.SaveSessionFilter.doFilter(SaveSessionFilter.java:35)
        at 
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
        at 
com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)
        at 
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
        at 
org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:360)
        at 
org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
        at 
org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
        at 
org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:712)
        at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
        at 
com.google.apphosting.runtime.jetty.AppVersionHandlerMap.handle(AppVersionHandlerMap.java:238)
        at 
org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:139)
        at org.mortbay.jetty.Server.handle(Server.java:313)
        at 
org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:506)
        at 
org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:830)
        at 
com.google.apphosting.runtime.jetty.RpcRequestParser.parseAvailable(RpcRequestParser.java:76)
        at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:381)
        at 
com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:139)
        at 
com.google.apphosting.runtime.JavaRuntime.handleRequest(JavaRuntime.java:239)
        at 
com.google.apphosting.base.RuntimePb$EvaluationRuntime$6.handleBlockingRequest(RuntimePb.java:5135)
        at 
com.google.apphosting.base.RuntimePb$EvaluationRuntime$6.handleBlockingRequest(RuntimePb.java:5133)
        at 
com.google.net.rpc.impl.BlockingApplicationHandler.handleRequest(BlockingApplicationHandler.java:24)
        at com.google.net.rpc.impl.RpcUtil.runRpcInApplication(RpcUtil.java:363)
        at com.google.net.rpc.impl.Server$2.run(Server.java:814)
        at 
com.google.tracing.LocalTraceSpanRunnable.run(LocalTraceSpanRunnable.java:56)
        at 
com.google.tracing.LocalTraceSpanBuilder.internalContinueSpan(LocalTraceSpanBuilder.java:516)
        at com.google.net.rpc.impl.Server.startRpc(Server.java:769)
        at com.google.net.rpc.impl.Server.processRequest(Server.java:351)
        at 
com.google.net.rpc.impl.ServerConnection.messageReceived(ServerConnection.java:437)
        at 
com.google.net.rpc.impl.RpcConnection.parseMessages(RpcConnection.java:319)
        at 
com.google.net.rpc.impl.RpcConnection.dataReceived(RpcConnection.java:290)
        at com.google.net.async.Connection.handleReadEvent(Connection.java:436)
        at 
com.google.net.async.EventDispatcher.processNetworkEvents(EventDispatcher.java:762)
        at 
com.google.net.async.EventDispatcher.internalLoop(EventDispatcher.java:207)
        at com.google.net.async.EventDispatcher.loop(EventDispatcher.java:101)
        at 
com.google.net.rpc.RpcService.runUntilServerShutdown(RpcService.java:251)
        at 
com.google.apphosting.runtime.JavaRuntime$RpcRunnable.run(JavaRuntime.java:396)
        at java.lang.Thread.run(Unknown Source)

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