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NetSuite Professionals

Can anyone help in SS2.0 following is my code
var rec = nRecord.create({
                type: nRecord.Type.SALES_ORDER,
                isDynamic: false,
                defaultValues: {
                    entity: cart.dealer.internalid,
                    customform: CONSTANTS.SALES_ORDER_FORM,
                    automaticallyapplypromotions: false

                }
            });
  rec.insertLine({
                    sublistId: 'promotions',
                    line: 1
                });
                nLog.debug('cart.promotion 1', cart.promotion)
                rec.setSublistValue({
                    sublistId: 'promotions',
                    fieldId: 'promocode',
                    value: cart.promotion,
                    line: 1
                });
*gives me* "type":"error.SuiteScriptError","name":"UNEXPECTED_ERROR","message":null,"stack":["anonymous(N/serverRecordService)",  error on line
rec.insertLine({
                    sublistId: 'promotions',
                    line: 1
                });