SOAP request error

Hello experts

I do a consult with javascript in SM script library to a XML file located in a external server, in some cases I see the next error

"No se puede evaluar la expresión (display,show.rio)
Arg. erróneo (2) oper. = (display,show.rio)
No se puede evaluar la expresión jscall("JavaScript.functionname", "XXXXXXXXXXX") (display,show.rio)
Script 'JavaScriot' línea 20: ERROR TypeError: Respuesta has no properties en car. 1
Error calling method: doSoapRequest in class: com/hp/ov/sm/server/utility/SoapClient Exception (javax.xml.transform.TransformerException: org.xml.sax.SAXParseE
xception; lineNumber: 1; columnNumber: 521; Character reference "&#26" is an invalid XML character.)
Error deserializing response: TypeError: this.resultXML has no properties
Error calling method: doSoapRequest in class: com/hp/ov/sm/server/utility/SoapClient Exception (javax.xml.transform.TransformerException: org.xml.sax.SAXParseE
xception; lineNumber: 1; columnNumber: 521; Character reference "&#26" is an invalid XML character.)
<soap:Envelope xmlns:ns0="">http://url" xmlns:ns1="http://www.w3.org/2006/05/addressing/wsdl" xmlns:ns2="http://schemas.xmlsoap.org/wsd
l/" xmlns:ns3="http://schemas.xmlsoap.org/wsdl/soap/" xmlns:ns4="http://ws-i.org/profiles/basic/1.1/xsd" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"><soap:Body><ns0:function xmlns:ns0="">url"><numeroCuenta xsi:type="xsd:string">XXXXXXXXXXX</numeroCuenta></ns0:function></soap:Body></soap:Envelope>"

Sometimes works properly

Do you have some idea to fix these? Please

Thank you in advance

Best regards