[SOAP] SOAP-ERROR: Parsing Schema: unresolved element 'ref' attribute

I am write the following function to access the soap webservice 

but i get the error as following

Error:
WSDL

Error Details:
SOAP-ERROR: Parsing Schema: unresolved element 'ref' attribute


Notice:  Undefined variable: client in
F:\xampp\htdocs\tj\functions\travel_functions.php on line 513



Fatal error:  Call to a member function __getLastRequest() on a non-object
in F:\xampp\htdocs\tj\functions\travel_functions.php

program is follows


	function
bookRoom($hotel_id,$check_in,$check_out,$rooms,$first_name,$last_name,$Guest,$bedtype,$smoke,$splreq,$address,$city,$state,$zip,$country,$areacode,$homephone,$workphone,$fax,$email,$totalcharge,$ccnum,$ccexpdate,$ccaddress,$cczip,$cclastname,$ccfirstname,$ccipaddress,$sitename,$tollfreeno,$ccsecuritycode)
	{
		error_reporting(E_ALL);
		$ini = ini_set("soap.wsdl_cache_enabled","0"); 
		try 
		{
			$client = new
SoapClient("https://twedixml.test.travelworm.com/xmls/service1.asmx?wsdl",
array("trace" => true, "exceptions" => true, 'soap_version' => SOAP_1_1));
			$parameter = array(
				'UserName' => $this->username,
				'UserID' => $this->userid,
				'HotelID' => $hotel_id,
				'CIDate' => $check_in,
				'CODate' => $check_out,
				'Rooms' => $rooms,
				'FirstName' => $first_name,
				'LastName' => $last_name,
				'Guests' => $Guest,
				'BedType' => $bedtype,
				'Smoking' => $smoke,
				'SpecReq' => $splreq,
				'Add' => $address,
				'City' => $city,
				'State' => $state,
				'Zip' => $zip,
				'Country' => $country,
				'AreaCode' => $areacode,
				'HPhone' => $homephone,
				'WPhone' => $workphone,
				'Fax' => $fax,
				'Email' => $email,
				'TotalCharge' => $totalcharge,
				'CCNum' => $ccnum,
				'CCExp' => $ccexpdate,
				'CCAdd' => $ccaddress,
				'CCZip' => $cczip,
				'CCLName' => $cclastname,
				'CCFName' => $ccfirstname,
				'IPAddress' => $ccipaddress,
				'SiteName' => $sitename,
				'TollFree' => $tollfreeno,
				'cardSecurityCode' => $ccsecuritycode);
			$result = $client->BookRoomToXmlFromStringParams2($parameter);
			$res=$client->__getLastResponse();
		}
		catch (SoapFault $ex)
		{
			echo "Error:
" . nl2br($ex->faultcode) . '
Error Details:
'. nl2br($ex->faultstring) . '
';
			echo("
REQUEST :
" . htmlspecialchars($client->__getLastRequest()) . "
");
			echo("
RESPONSE:
" .htmlspecialchars($client->__getLastResponse()) . "
");
			return "ERROR ".nl2br($ex->faultstring);
		} 
		return $res;
//		return $this->HotelsInformationToXML_xml($res);
	}

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