web service consume error

Hi all:
I am using wM 8.
I have to consume a web service from a task. I tried first from Integration Server and everything works. (I created a WSD, a Flow Service using the WS connector and then run from Designer).

When I try to use it from a task, I have an IOException error (see below full error).
The Web service has user authentication but I put the correct user & password in authentication info/username & password.
The server has network access to the web service.
Any idea?
Thanks
Hernan

java.rmi.MarshalException: java.io.IOException: java.lang.NullPointerException
at electric.soap.wsdl.SOAPOperation.writeRequest(SOAPOperation.java:403)
at electric.soap.java.reference.JavaToSOAP.invoke(JavaToSOAP.java:223)
at electric.soap.java.reference.JavaToSOAP.invoke(JavaToSOAP.java:165)
at electric.proxy.handler.Proxy.invoke(Proxy.java:126)
at $Proxy63.BusinessPartnerBasicDataByNameAndAddressQueryResponse_In(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.webmethods.caf.wsclient.proxy.impl.WSClientDynamicProxy.invokeMethod(WSClientDynamicProxy.java:89)
at com.webmethods.caf.wsclient.proxy.impl.WSClientDynamicProxy.invoke(WSClientDynamicProxy.java:134)
at $Proxy62.BusinessPartnerBasicDataByNameAndAddressQueryResponse_In(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.webmethods.caf.faces.data.object.ObjectMethodContentProvider.refresh(ObjectMethodContentProvider.java:366)
at sun.reflect.GeneratedMethodAccessor793.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.sun.el.parser.AstValue.invoke(AstValue.java:187)
at com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:297)
at com.sun.faces.application.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:88)
at com.webmethods.caf.faces.application.CAFMethodBinding.invoke(CAFMethodBinding.java:67)
at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102)
at javax.faces.component.UICommand.broadcast(UICommand.java:387)
at com.webmethods.caf.faces.component.ViewRoot.broadcastEvents(ViewRoot.java:202)
at com.webmethods.caf.faces.component.ViewRoot.processApplication(ViewRoot.java:116)
at com.webmethods.caf.faces.portlet.PortletLifecycle$InvokeApplicationPhase.execute(PortletLifecycle.java:678)
at com.webmethods.caf.faces.portlet.PortletLifecycle.phase(PortletLifecycle.java:250)
at com.webmethods.caf.faces.portlet.PortletLifecycle.execute(PortletLifecycle.java:145)
at com.webmethods.caf.faces.portlet.FacesPortlet.processAction(FacesPortlet.java:245)
at com.webmethods.portal.framework.portletcontainer.impl.PortletApplicationHandler.process(PortletApplicationHandler.java:479)
at com.webmethods.portal.framework.portletcontainer.servlet.PortletServlet.service(PortletServlet.java:58)
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.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:726)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
at org.mortbay.jetty.servlet.Dispatcher.forward(Dispatcher.java:285)
at org.mortbay.jetty.servlet.Dispatcher.forward(Dispatcher.java:126)
at com.webmethods.portal.framework.portletcontainer.PortletContainer.dispatch(PortletContainer.java:218)
at com.webmethods.portal.framework.portletcontainer.PortletContainer.process(PortletContainer.java:129)
at com.webmethods.portal.framework.portletcontainer.PortletContainer.processPortletAction(PortletContainer.java:107)
at com.webmethods.portal.framework.portlet.beans.rest.RestfulPCAHandler.handle(RestfulPCAHandler.java:194)
at com.webmethods.portal.framework.dispatch.DispatchManager.handle(DispatchManager.java:442)
at com.webmethods.portal.framework.dispatch.DispatchManager.handleDispatch(DispatchManager.java:372)
at com.webmethods.portal.framework.impl.PortalServlet.service(PortalServlet.java:245)
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$CachedChain.doFilter(ServletHandler.java:1093)
at com.webmethods.portal.framework.impl.NTLMFilter.doFilter(NTLMFilter.java:50)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
at com.webmethods.caf.faces.servlet.GZIPFilter.doFilter(GZIPFilter.java:42)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:360)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:726)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
at org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:206)
at org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:139)
at org.mortbay.jetty.Server.handle(Server.java:324)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:505)
at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:842)
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.BoundedThreadPool$PoolThread.run(BoundedThreadPool.java:450)

Hi Hernan,
Are you able to see if the request is being sent (using for example the MWS portlet wm_soapmonitor, or tcpmon, or nettool)? If so, is the message sent correct?
One further question, do you really need to call the web service directly from the UI? You could call it from IS (which adds a layer and an extra call, but may make it easier to maintain later in case the service changes).

best regards,
Javier