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elem parameter must not be null!
java.lang.NullPointerException: elem parameter must not be null!	at org.apache.ode.utils.DOMUtils.getFirstChildElement(DOMUtils.java:215)	at org.apache.ode.axis2.util.SOAPUtils.wrap(SOAPUtils.java:74)	at org.apache.ode.axis2.ExternalService.invoke(ExternalService.java:78)	at org.apache.ode.axis2.MessageExchangeContextImpl.invokePartner(MessageExchangeContextImpl.java:52)	at org.apache.ode.bpel.engine.BpelRuntimeContextImpl.invoke(BpelRuntimeContextImpl.java:690)	at org.apache.ode.bpel.runtime.INVOKE.run(INVOKE.java:95)	at sun.reflect.GeneratedMethodAccessor60.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:585)	at org.apache.ode.jacob.vpu.JacobVPU$JacobThreadImpl.run(JacobVPU.java:467)	at org.apache.ode.jacob.vpu.JacobVPU.execute(JacobVPU.java:148)	at org.apache.ode.bpel.engine.BpelRuntimeContextImpl.execute(BpelRuntimeContextImpl.java:730)	at org.apache.ode.bpel.engine.BpelProcess$PartnerLinkMyRoleImpl.invokeMyRole(BpelProcess.java:467)	at org.apache.ode.bpel.engine.BpelProcess.invokeProcess(BpelProcess.java:170)	at org.apache.ode.bpel.engine.MyRoleMessageExchangeImpl.invoke(MyRoleMessageExchangeImpl.java:114)	at org.apache.ode.axis2.ODEService.onAxisMessageExchange(ODEService.java:121)	at org.apache.ode.axis2.hooks.ODEMessageReceiver.invokeBusinessLogic(ODEMessageReceiver.java:78)	at org.apache.ode.axis2.hooks.ODEMessageReceiver.receive(ODEMessageReceiver.java:53)	at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:454)	at org.apache.axis2.transport.http.HTTPTransportUtils.processHTTPPostRequest(HTTPTransportUtils.java:284)	at org.apache.axis2.transport.http.AxisServlet.doPost(AxisServlet.java:136)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:709)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)	at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)	at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)	at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)	at java.lang.Thread.run(Thread.java:595)