Call WS

Hi!

I'm trying to call an web service using  Visual Basic in a spreadsheet but it returns me an error:

xsi:type="xsd:int">0</traceRequestSize></technicalInfos></runReturn></wss:runResponse><multiRef id="id0" soapenc:root="0" soapenv:encodingStyle="">schemas.xmlsoap.org/.../" xsi:type="wss:CAdxMessage"><type>4</type><message>Cannot read property &apos;length&apos; of undefined</message></multiRef></soapenv:Body></soapenv:Envelope>

I have tested it using X3 ans Soap UI, it worked, but when a Try to fullfill the spreadsheet it returns me that error, can somebody please help me?