SOAP no XML document

<?php
	try {
		$oClient = new SoapClient(null, array('location' => 'http://www.beterlopen.net/soap/test/soapserver.php', 'uri' => 'receptenzoeker/SOAP/test/'));
		echo 'Voornaam: '.$oClient->getVoornaam();
	}
	catch(SoapFault $e) {
		echo $e->getMessage().$e->getLine();
	}
?>

<?php
	try {
		$oClient = new SoapClient(null, array('location' => 'http://www.beterlopen.net/soap/test/soapserver.php', 'uri' => 'receptenzoeker/SOAP/test/'));
		echo 'Voornaam: '.$oClient->getVoornaam();
	}
	catch(SoapFault $e) {
		echo $e->getMessage().$e->getLine();
	}
?>

<?php
	class Service
	{
		
		public function getVoornaam()
		{
			return 'Pijke';
		}
		
	}
	
	/**
	 *SOAPServer
	 */
	 $oServer = new SoapServer(null, array('uri' => 'receptenzoeker/SOAP/test/', 'encoding' => 'utf-8'));
	 $oServer->setClass('Service');
	 $oServer->handle();
?>

<?php
	class Service
	{
 
		public function getVoornaam()
		{
			return 'Pijke';
		}
 
	}
 
	/**
	 *SOAPServer
	 */
	 $oServer = new SoapServer(null, array('uri' => 'receptenzoeker/SOAP/test/', 'encoding' => 'utf-8'));
	 $oServer->setClass('Service');
	 $oServer->handle();
?>

Fatal error: Class 'SoapServer' not found in /home/goedevoet/domains/beterlopen.net/public_html/soap/test/soapserver.php on line 15

Fatal error: Class 'SoapServer' not found in /home/goedevoet/domains/beterlopen.net/public_html/soap/test/soapserver.php on line 15