Building Cascading Lists for Query Screens

hi all:
i tries to follow the tutorial for Building Cascading Lists for Query Screens, but i get the following error:
oracle.jbo.InvalidOperException: JBO-25063: ?? ???? ?????? ?????? getCurrentRowSlot ??? ???? ?????? ????? ??? ??????. at oracle.jbo.common.ws.WSObject.invalidOperation(WSObject.java:49) at oracle.jbo.common.ws.WSRowSetIteratorBase.getCurrentRowSlot(WSRowSetIteratorBase.java:500) at oracle.adf.model.binding.DCIteratorBinding.internalGetCurrentRowInBinding(DCIteratorBinding.java:1628) at oracle.adf.model.binding.DCIteratorBinding.getCurrentRow(DCIteratorBinding.java:1605) at oracle.jbo.uicli.binding.JUCtrlListBinding.getSelectedIndex(JUCtrlListBinding.java:516) at oracle.jbo.uicli.binding.JUCtrlListBinding.toString(JUCtrlListBinding.java:933) at org.apache.commons.beanutils.BeanUtils.getArrayProperty(BeanUtils.java:558) at org.apache.struts.taglib.html.SelectTag.calculateMatchValues(SelectTag.java:309) at org.apache.struts.taglib.html.SelectTag.doStartTag(SelectTag.java:244) at gonow.jspService(gonow.jsp:12) [gonow.jsp] at com.orionserver[Oracle Application Server Containers for J2EE 10g (10.1.2.0.2)].http.OrionHttpJspPage.service(OrionHttpJspPage.java:57) at oracle.jsp.runtimev2.JspPageTable.service(JspPageTable.java:350) at oracle.jsp.runtimev2.JspServlet.internalService(JspServlet.java:509) at oracle.jsp.runtimev2.JspServlet.service(JspServlet.java:413) at javax.servlet.http.HttpServlet.service(HttpServlet.java:853) at com.evermind[Oracle Application Server Containers for J2EE 10g (10.1.2.0.2)].server.http.ResourceFilterChain.doFilter(ResourceFilterChain.java:65) at oracle.security.jazn.oc4j.JAZNFilter.doFilter(Unknown Source) at com.evermind[Oracle Application Server Containers for J2EE 10g (10.1.2.0.2)].server.http.EvermindFilterChain.doFilter(EvermindFilterChain.java:16) at oracle.adf.model.servlet.ADFBindingFilter.doFilter(ADFBindingFilter.java:239) at com.evermind[Oracle Application Server Containers for J2EE 10g (10.1.2.0.2)].server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:659) at com.evermind[Oracle Application Server Containers for J2EE 10g (10.1.2.0.2)].server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:330) at com.evermind[Oracle Application Server Containers for J2EE 10g (10.1.2.0.2)].server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:830) at com.evermind[Oracle Application Server Containers for J2EE 10g (10.1.2.0.2)].server.http.HttpRequestHandler.run(HttpRequestHandler.java:285) at com.evermind[Oracle Application Server Containers for J2EE 10g (10.1.2.0.2)].server.http.HttpRequestHandler.run(HttpRequestHandler.java:126) at com.evermind[Oracle Application Server Containers for J2EE 10g (10.1.2.0.2)].util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:192) at java.lang.Thread.run(Thread.java:534)

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