problème service web csharp et client php

bonjour

j'ai un client php utilisant la bibliothèque nusoap qui doit consommer un service web csharp quand je lance le client j'ai la reponse suivante : Array
voici mon client php:

Code:

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"> 
	<head>
		<title>PHP test</title>
		<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
       <link rel="stylesheet" media="screen" type="text/css" title="Design" href="style.css" />
	</head> 
<body> 
 
		<p>			
		<?php
              include ('lib/nusoap.php') ;
			 	  $client = new nusoap_client('http://localhost:1102/Service1.asmx');
 
 
				$parametres = array('nom'=>'lettre');
 
		?> 
		<?php
echo $client->call('HelloWorld', $parametres);
?>
</p>
 
</body>
</html>

et voici mon service

Code:

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using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Services;
using System.Web.Services.Protocols;
using System.Configuration;
using System.Xml.Linq;
 
namespace WebService1
{
    /// <summary>
    /// Description résumée de Service1
    /// </summary>
    [WebService(Namespace = "http://tempuri.org/")]
    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
    [ToolboxItem(false)]
 
    public class Service1 : System.Web.Services.WebService
    {
        [WebMethod]
        public string HelloWorld(string nom)
        {
            return "Hello " + nom;
 
        }
    }
}