duda vb2008 express con webservice php

[mveraa]

hola maestros tengo una duda en conectarme en vb2008 con webservice php

script sever php

<?
error_reporting(0);
require_once("nusoap.php");
$ns="http://localhost/WEBSERVICE/nusoap/lib";

$server = new soap_server();
$server->configureWSDL('hola',$ns);
$server->wsdl->schemaTargetNamespace=$ns;

$server->register('hola',array('user' => 'xsd:string'),array('return' => 'xsd:string'),$ns);

function hola($user)
{
//$taxcalc=$amount*.15;
//return new soapval('return','string',$taxcalc);

return "Hola $user";

}

$server->service($HTTP_RAW_POST_DATA);
?>


ahora esto pongo en vb2008

Dim a As New ServiceReference1.holaPortTypeClient
Dim equipo As String
Dim a1 As String


a1 = Str((a.hola("j")))
MsgBox(a1)



me da este error
The content type text/xml; charset=ISO-8859-1 of the response message does not match the content type of the binding (text/xml; charset=utf-8). If using a custom encoder, be sure that the IsContentTypeSupported method is implemented properly. The first 530 bytes of the response were: '<?xml version="1.0" encoding="ISO-8859-1"?><SOAP-ENV:Envelope SOAP-ENV:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/" xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/"><SOAP-ENV:Body><ns1:holaResponse xmlns:ns1="http://localhost/WEBSERVICE/nusoap/lib"><return xsi:type="xsd:string">Hola j</return></ns1:holaResponse></SOAP-ENV:Body></SOAP-ENV:Envelope>'.

y a1 esta en "nothing"

gracias por la orientacion.