SSS_INVALID_SRCH_OPERATOR error while using nlobjSearchFilter

Hi everyone,

I got a problem with searchfilter in this code.
while running this script it is displaying the error Error: SSS_INVALID_SRCH_OPERATOR

Here in this script i am searching according to some values in some custom item fields to be compared.





var filters = new Array();
filters[0] = new nlobjSearchFilter('custitem5', null, 'is', nlapiGetCurrentLineItemValue('item', 'custcol22'));
           
filters[1] = new nlobjSearchFilter('custitem6', null, 'is', nlapiGetCurrentLineItemValue('item', 'custcol21'));
           
filters[2] = new nlobjSearchFilter('custitem3', null, 'is', nlapiGetCurrentLineItemValue('item', 'custcol4'));

filters[3] = new nlobjSearchFilter('custitem2', null, 'is', nlapiGetCurrentLineItemValue('item', 'custcol5'));
           
           
           
           
            // Define search columns
            var columns = new Array();
            columns[0] = new nlobjSearchColumn('itemid');