I have enabled sorting in datatables but its not working

rushiweb

$('#article-table').DataTable( {
"dom": '<"top"i>rt<"bottom"flp><"clear">',
"bProcessing": true,
"bServerSide": true,
"iDisplayStart":0,
"iDisplayLength":50,
"sScrollY":"400px",
"bDestroy": true,
"bScrollCollapse":true,
"bPagination":true,
"bSort": true,
"ordering": true,
"bFilter": false,
"bInfo": false,
"sAjaxSource": "/dashboard/view_dashboard/",
"fnDrawCallback":function(data){

    }
} );