Forum Post: Err "The operand for the method is not an element"

OrderListPageInteraction->SelectionChanged() In the SelectionMethod of order list page the code below give current active record of listPage OrderTable orderCurrent= this.listPage().activeRecord(queryDataSourceStr(OrderListPage, OrderTable )); However while Compiling; it produces the err i.e. The operand for the method is not an element. As a result of which I google the parameters of the function queryDataSourceStr() which specifies as: str queryDataSourceStr(queryName, dataSourceName ) source: https://msdn.microsoft.com/en-us/library/gg895213.aspx B ut the error remains the same. p.s. im attaching the image of the interaction class code