Hello World in Web Dynpro Java : exceptions

Hi
I am trying out the Hello World tutorial. But hit the error after the deployment and trial run. Please advice. Thanks in advance.
500   Internal Server Error
Failed to process request. Please contact your system administrator.
java.lang.IllegalArgumentException: -1
     at com.sap.tc.webdynpro.clientserver.uielements.adaptbase.IndexedItemsIterator.advanceIndex(IndexedItemsIterator.java:104)
     at com.sap.tc.webdynpro.clientserver.uielib.standard.uradapter.GridLayoutAdapter$Cells.doNext(GridLayoutAdapter.java:368)
     at com.sap.tc.webdynpro.clientserver.uielements.adaptbase.IndexedItemsIterator.next(IndexedItemsIterator.java:54)
     at com.sap.tc.ur.renderer.nn7.GridLayoutRenderer.renderGridLayoutRowFragment(GridLayoutRenderer.java:401)
     at com.sap.tc.ur.renderer.nn7.GridLayoutRenderer.renderGridLayoutFragment(GridLayoutRenderer.java:312)
     at com.sap.tc.ur.renderer.nn7.GridLayoutRenderer.render(GridLayoutRenderer.java:79)
     at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.base.RenderManager.render(RenderManager.java:434)
     at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.base.RenderManager.render(RenderManager.java:133)
     at com.sap.tc.ur.renderer.nn7.ScrollContainerRenderer.renderScrollContainerFragment(ScrollContainerRenderer.java:572)
     at com.sap.tc.ur.renderer.nn7.ScrollContainerRenderer.render(ScrollContainerRenderer.java:74)
     at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.base.RenderManager.render(RenderManager.java:434)
     at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.base.RenderManager.render(RenderManager.java:133)
     at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.base.UiWindowRenderer.render(UiWindowRenderer.java:52)
     at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.base.RenderManager.render(RenderManager.java:434)
     at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.base.RenderManager.render(RenderManager.java:133)
     at com.sap.tc.webdynpro.clientimpl.html.client.HtmlClient.sendHtml(HtmlClient.java:1056)
     at com.sap.tc.webdynpro.clientimpl.html.client.HtmlClient.fillDynamicTemplateContext(HtmlClient.java:456)
     at com.sap.tc.webdynpro.clientimpl.html.client.HtmlClient.sendResponse(HtmlClient.java:1240)
     at com.sap.tc.webdynpro.clientimpl.html.client.HtmlClient.retrieveData(HtmlClient.java:252)
     at com.sap.tc.webdynpro.clientserver.window.WindowPhaseModel.doRetrieveData(WindowPhaseModel.java:595)
     at com.sap.tc.webdynpro.clientserver.window.WindowPhaseModel.processRequest(WindowPhaseModel.java:156)
     at com.sap.tc.webdynpro.clientserver.window.WebDynproWindow.processRequest(WebDynproWindow.java:335)
     at com.sap.tc.webdynpro.clientserver.cal.AbstractClient.executeTasks(AbstractClient.java:143)
     at com.sap.tc.webdynpro.clientserver.session.ApplicationSession.doProcessing(ApplicationSession.java:319)
     at com.sap.tc.webdynpro.clientserver.session.ClientSession.doApplicationProcessingStandalone(ClientSession.java:713)
     at com.sap.tc.webdynpro.clientserver.session.ClientSession.doApplicationProcessing(ClientSession.java:666)
     at com.sap.tc.webdynpro.clientserver.session.ClientSession.doProcessing(ClientSession.java:250)
     at com.sap.tc.webdynpro.clientserver.session.RequestManager.doProcessing(RequestManager.java:149)
     at com.sap.tc.webdynpro.serverimpl.defaultimpl.DispatcherServlet.doContent(DispatcherServlet.java:62)
     at com.sap.tc.webdynpro.serverimpl.defaultimpl.DispatcherServlet.doGet(DispatcherServlet.java:46)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.runServlet(HttpHandlerImpl.java:401)
     at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.handleRequest(HttpHandlerImpl.java:266)
     at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:386)
     at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:364)
     at com.sap.engine.services.httpserver.server.RequestAnalizer.invokeWebContainer(RequestAnalizer.java:1039)
     at com.sap.engine.services.httpserver.server.RequestAnalizer.handle(RequestAnalizer.java:265)
     at com.sap.engine.services.httpserver.server.Client.handle(Client.java:95)
     at com.sap.engine.services.httpserver.server.Processor.request(Processor.java:175)
     at com.sap.engine.core.service630.context.cluster.session.ApplicationSessionMessageListener.process(ApplicationSessionMessageListener.java:33)
     at com.sap.engine.core.cluster.impl6.session.MessageRunner.run(MessageRunner.java:41)
     at com.sap.engine.core.thread.impl3.ActionObject.run(ActionObject.java:37)
     at java.security.AccessController.doPrivileged(Native Method)
     at com.sap.engine.core.thread.impl3.SingleThread.execute(SingleThread.java:102)
     at com.sap.engine.core.thread.impl3.SingleThread.run(SingleThread.java:172)

Hi,
   It is quite hard to find out the problem by seeing only exception trace. I think you are missing one of the mandatory elelments' properties or setting them to invalid values. Please check and let me know if you can give more information.
Regards,
Siva

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    hi Bhargava
    sorry for the late..
    no in the init method i do the binding of the parametere, because if i'dont it in the init mothod the parameters are not editable..
    Link:[http://img29.imageshack.us/i/56a7250185252a1d06af141.png/]
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         wdContext.nodeIt_Input_Items().bind(table); 
              input.setIv_Bp(input.getIv_Bp());
                   input.setIv_Currency(input.getIv_Currency());
                   input.setIv_Description(input.getIv_Description());
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                   input.setIv_Ord_Delivery_Date(input.getIv_Ord_Delivery_Date());
                   input.setIv_Order_Guid(input.getIv_Order_Guid());
                   input.setIv_Pers_Resp(input.getIv_Pers_Resp());
                   input.setIv_Po_Number_Sold(input.getIv_Po_Number_Sold());
                   input.setIv_Proc(input.getIv_Proc());
                   input.setIv_Save(input.getIv_Save());
                   input.setIv_Selected_Prod(input.getIv_Selected_Prod());
                   input.setIv_Ship_To(input.getIv_Ship_To());
              for(int i=0;i<wdContext.nodeIt_Input_Items().size(); i++) {               
                   //wdContext.nodeIt_Input_Items().ge
                   table.setOrder_Qty(wdContext.nodeIt_Input_Items().getIt_Input_ItemsElementAt(i).getOrder_Qty());
                   table.setProd(wdContext.nodeIt_Input_Items().getIt_Input_ItemsElementAt(i).getProd());
                   table.setDelivery_Date(wdContext.nodeIt_Input_Items().getIt_Input_ItemsElementAt(i).getDelivery_Date());
                   table.setSequence(wdContext.nodeIt_Input_Items().getIt_Input_ItemsElementAt(i).getSequence());
                   table.setUom(wdContext.nodeIt_Input_Items().getIt_Input_ItemsElementAt(i).getUom());
                   table.setLine_Guid(wdContext.nodeIt_Input_Items().getIt_Input_ItemsElementAt(i).getLine_Guid());
                   input.addIt_Input_Items(table);
        //@@end
    this is the init...
    in the button method
      public void CreateOrder( )
        //@@begin CreateOrder()
         try
              wdContext.currentNode_custom_controllerElement().modelObject().execute();
              wdContext.nodeOutput().invalidate();
              catch (Exception ex)
               ex.printStackTrace();
        //@@end

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