Add a field to a form using a script

function empLocationSearch(currentEmpID) {
            try {

                var employeeSearchObj = search.create({
                    type: "employee",
                    filters:
                        [
                            ["internalid", "anyof", currentEmpID],
                            "AND",
                            // ["location","anyof","29"]
                            ["isinactive", "is", "F"],
                        ],
                    columns:
                        [
                            search.createColumn({ name: "internalid", label: "Internal ID" }),
                            search.createColumn({ name: "location", label: "Location" })
                        ]
                });
                var searchResultCount = employeeSearchObj.runPaged().count;
                log.debug("searchResultCount", searchResultCount)
                let location
                if (searchResultCount > 0) {
                    employeeSearchObj.run().each(function (result) {
                        location = result.getValue({
                            name: "location", label: "Location"
                        })

                    });
                    return location;
                }
                else {
                    return false
                }
            }
            catch (err) {
                log.debug("error@empLocationSearch", err)
            }
        }





let sales_location_field = currentform.addField({
                    id: 'custpage_saleslocation_field',
                    type: serverWidget.FieldType.TEXT,
                    label: 'Sales Associate Location'
                })
let salesAssociateLocation = empLocationSearch(salesAssociate) 
if (salesAssociateLocation) {
                    currentRecord.setValue({
                        fieldId: 'custpage_saleslocation_field',
                        value: salesAssociateLocation
                    })
                }
sales_location_field.updateDisplayType({
                    displayType: serverWidget.FieldDisplayType.HIDDEN
                });