How can I create an element in the model node?

Hi, Experts,
I create a model node that name is containerNode in the contxt. Cadinility is: 1..n
I write the code in the method:
private String getDataForOutputTable( IWDNode wageTypePayslip, IWDNode containerNode ){
 String betrgSumStr = "";
 int index = 0;
 Vector containerVector = new Vector();
 int size = wageTypePayslip.size();
 IWDNodeElement element = containerNode.createElement();// The system report error when I run the application.
 BigDecimal betrgSum = new BigDecimal( 0 );
I try to create a element in the containerNode, But the system report error when I run the application.
java.lang.IllegalArgumentException: model object must not be null
 at com.sap.tc.webdynpro.progmodel.context.ModelNodeElement.<init>(ModelNodeElement.java:66)
 at besuretech.com.wdp.IPrivatePayDataDispView$IOContainerElement.<init>(IPrivatePayDataDispView.java:1537)
 at besuretech.com.wdp.IPrivatePayDataDispView$IContextNode.doCreateElement(IPrivatePayDataDispView.java:88)
 at com.sap.tc.webdynpro.progmodel.context.NodeInfo.createElement(NodeInfo.java:884)
 at com.sap.tc.webdynpro.progmodel.context.Node.createElementInternal(Node.java:1351)
 at com.sap.tc.webdynpro.progmodel.context.Node.createElement(Node.java:1370)
 at besuretech.com.PayDataDispView.getDataForOutputTable(PayDataDispView.java:251)
 at besuretech.com.PayDataDispView.getAllData(PayDataDispView.java:196)
 at besuretech.com.PayDataDispView.onPlugPayListViewIn(PayDataDispView.java:154)
 at besuretech.com.wdp.InternalPayDataDispView.wdInvokeEventHandler(InternalPayDataDispView.java:391)
 at com.sap.tc.webdynpro.progmodel.generation.DelegatingView.invokeEventHandler(DelegatingView.java:87)
 at com.sap.tc.webdynpro.clientserver.cal.ClientApplication.navigate(ClientApplication.java:826)
 at com.sap.tc.webdynpro.clientserver.cal.ClientComponent.navigate(ClientComponent.java:881)
 at com.sap.tc.webdynpro.clientserver.window.WindowPhaseModel.doNavigation(WindowPhaseModel.java:498)
How can I create an element in the model node ?
Best regards,
tao

Hi,
You need to execute the model before creating the element.
Regards
Ayyapparaj

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