footercallback does not calculates the column value

It works fine on live.datatables but it does not workout in the development environment (too many fields are used), though i used numeral.js script
reference:

here is my code:

       "footerCallback": function ( row, data, start, end, display ) {
            var api = this.api();
 
            // Remove the formatting to get integer data for summation
            var intVal = function ( i ) {
                return typeof i === 'string' ?
                    i.replace(/[\MB,KB,GB,TB,]/g, '')*1 :
                    typeof i === 'number' ?
                    numeral(i).value() : i;
            };
 
            // Total over all pages
            total = api
                .column( 3 )
                .data()
                .reduce( function (a, b) {
                    return intVal(a) + intVal(b);
                }, 0 );
 
            // Total over this page
            pageTotal = api
                .column( 3, { page: 'current'} )
                .data()
                .reduce( function (a, b) {
                    return intVal(a) + intVal(b);
                }, 0 );
 
            total = numeral(total).format('0.0a');
            pageTotal = numeral(pageTotal).format('0.0a');
          $( api.column( 3 ).footer() ).html(
             '--'+pageTotal +' ( --'+ total +' total)'
            );
        }

Please let me know where did i go wrong?

Thanks
Koka