trying to use getValue() to get field in saved search results

HI

Im currently trying to resolve an issue where I cant get a value from a suitelet from a savedsearch within Netsuite.
 
var _searchId = 'customsearch_pm_item_record_loader';         //itemFilters.push(new nlobjSearchFilter('displayName',null, 'contains', _searchTerm )); //         var rs = nlapiSearchRecord('item', _searchId, itemFilters,columns);         for ( var i = 0; rs != null && i < rs.length; i++)         {                var rowObj = {};             rowObj.id = rs[i].getValue('internalid');             rowObj.custitem_dwr_co_dis  = rs[i].getValue('custitem_dwr_co_dis');             rowObj.salesdescription     = rs[i].getValue('salesdescription');             rowObj.displayName          = rs[i].getValue('displayName');             rowObj.itemid               = rs[i].getValue('itemid');             rowObj.unitPrice            = rs[i].getValue('unitprice', 'pricing');   // unit price