cant submit request in service portal

[yana7]

On the Service Portal when submitting a Request an alert appears to contact the admin. Meanwhile, this appears in the log

Root cause of JavaScriptException: com.glide.rest.service.custom.errors.ScriptableServiceError
JavaScript evaluation error on:
(function process(/*RESTAPIRequest*/ request, /*RESTAPIResponse*/ response) {
var request_body = request.body.nextEntry();
var quantity = '' + request_body.sysparm_quantity;
var noValidation = (request_body.sysparm_no_validation == 'true');

if (!/^\+?([0-9]*)$/.test(quantity))
throw new sn_ws_err.BadRequestError("Invalid Quantity value");
else
request_body.sysparm_quantity = quantity;

var itemId = '' + request.pathParams.sys_id;
request_body.sysparm_id = itemId;
var catItem = new sn_sc.CatItem(itemId);
if (!catItem.canView())
throw new sn_ws_err.BadRequestError("Security constraints prevent ordering of Item");

var catUtil = new RestCatalogUtil();
for (var key in request_body.variables)
if (request_body.variables.hasOwnProperty(key) && request_body.variables[key] != null && typeof(request_body.variables[key]) !== 'string')
request_body.variables[key] = catUtil.getFieldValueAsString(key, request_body.variables[key], itemId);

if (!noValidation) {
if (!catUtil.checkMandatoryVariables(itemId, request_body.variables))
throw new sn_ws_err.BadRequestError('Mandatory Variables are required');
}
var messages = catUtil.validateVariableRegex(itemId, request_body.variables);
if (messages && messages.length > 0) {
var errorResponse = {};
errorResponse.errMsg = messages.join();
response.setStatus(400);
return errorResponse;
}

var mrvsErrorMessages = catUtil.validateMaxRowCountMultiRowVS('sc_cat_item', itemId, itemId, request_body.variables);
if (mrvsErrorMessages && mrvsErrorMessages.length > 0) {
var errors = mrvsErrorMessages.join();
throw new sn_ws_err.BadRequestError(errors);
}
var cartName = "cart_" + gs.generateGUID() + "_" + itemId;
var cart = new sn_sc.CartJS(cartName);
request_body.sysparm_cart_name = cartName;
var response_body = {};
try {
response_body = cart.orderNow(request_body);
} catch(e) {
gs.debug(e);
var catalogExceptionUtils = new global.CatalogExceptionUtils();
if(catalogExceptionUtils.isCartException(e))
response_body = catalogExceptionUtils.handleCartExceptionInPortal(e);
else
throw new sn_ws_err.ServiceError('Invalid Request');
}
if (response_body.errMsg)
response.setStatus(400);

return response_body;
})(request, response);
: no thrown error