Simple PHP Soap Server and Client Issue - php

Question

I have the following codes copied directly from here:
http://www.codeproject.com/Tips/671437/Creating-Web-Service-Using-PHP-Within-Minutes
Server:
<?php
//call library
require_once ('nusoap.php');
//using soap_server to create server object
$server = new soap_server;
//register a function that works on server
$server->register('get_message');
// create the function
function get_message($your_name)
{
if(!$your_name){
return new soap_fault('Client','','Put Your Name!');
}
$result = "Welcome to ".$your_name .". Thanks for Your First Web Service Using PHP with SOAP";
return $result;
}
// create HTTP listener
$server->service($HTTP_RAW_POST_DATA);
exit();
?>
Client:
<?php
require_once ('nusoap.php');
//Give it value at parameter
$param = array( 'your_name' => 'Cool Guy');
//Create object that referer a web services
$client = new soapclient('http://localhost/SOAPServer.php');
//Call a function at server and send parameters too
$response = $client->call('get_message',$param);
//Process result
if($client->fault)
{
echo "FAULT: <p>Code: (".$client->faultcode."</p>";
echo "String: ".$client->faultstring;
}
else
{
echo $response;
}
?>
When I try to access the client page, it shows me the following error:
FAULT: Code: (SOAP-ENV:Client
String: error in msg parsing: xml was empty, didn't parse!
I would only need this simple example working, what could be the problem?