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javax.el.ELException: java.lang.NullPointerException at javax.el.BeanELResolver.getValue( at com.sun.faces.el.DemuxCompositeELResolver._getValue( at$PanelCollectionHelper._encodeAll( at$PanelCollectionHelper.access$500( at at at org.apache.myfaces.trinidad.render.CoreRenderer.encodeEnd( at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd( at javax.faces.component.UIComponent.encodeAll(