SoapUI INTERNAL_SERVER_ERROR NullPointerException AbstractMessageExchange.java:33

in SoapUI-5.4.0 when I launch HTTP monitor and send a request to tunnel or proxy it says error 500 as below.

Please help.

There are no error in log.

note: I have already tried these: Endpoint is reachable by simple http request. And Proxy config is not the case.

HTTP ERROR 500

Problem accessing /. Reason:

    INTERNAL_SERVER_ERROR

 

Caused by:

java.lang.NullPointerException
	at com.eviware.soapui.impl.wsdl.submit.AbstractMessageExchange.<init>(AbstractMessageExchange.java:33)
	at com.eviware.soapui.impl.wsdl.submit.AbstractWsdlMessageExchange.<init>(AbstractWsdlMessageExchange.java:36)
	at com.eviware.soapui.impl.wsdl.monitor.WsdlMonitorMessageExchange.<init>(WsdlMonitorMessageExchange.java:28)
	at com.eviware.soapui.impl.wsdl.monitor.JProxyServletWsdlMonitorMessageExchange.<init>(JProxyServletWsdlMonitorMessageExchange.java:81)
	at com.eviware.soapui.impl.wsdl.monitor.jettyproxy.TunnelServlet.service(TunnelServlet.java:104)
	at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
	at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:401)
	at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:766)
	at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
	at org.mortbay.jetty.Server.handle(Server.java:326)
	at com.eviware.soapui.impl.wsdl.monitor.jettyproxy.JettyServer.handle(JettyServer.java:76)
	at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
	at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:928)
	at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:549)
	at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)
	at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
	at org.mortbay.jetty.bio.SocketConnector$Connection.run(SocketConnector.java:228)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)

---

Powered by Jetty://