Pluck returns blank values

Hello,
Have an issue with the pluck() function. it seems to be returning blank values. Any suggestion.
{ extend: "edit", className: 'btnSelect2', editor: editor, text: "Delete Leave Request", formTitle: "Delete Leave Requests", formMessage: function (e, dt) { var rows = dt.rows(e.modifier()).data().pluck('cdi_calendar_changes.date1'); return 'Are you sure you want to delete the entries for the ' + 'following record(s)? <ul><li>' + rows.join('</li><li>') + '</li></ul>'; }