SOAP problems

[LoOpy]

Error:
Server was unable to process request. ---> Object reference not set to an instance of an object.

 

What am i doing wrong, im trying to edit the request, the output of the __dorequest() looks perfect but the __getLastRequest() still looks like the original format am i missing a step am I calling things worng im kinda fumbling in the dark here i need some direction.

 

Any help is much aprieciated

 

Thanks

 

running php 5.2.3 on IIS trying to connect to a asp.net soap service.

 

<?php
$wsdl = "http://locationcheck.netstaronline.net/LocationChecker.asmx?WSDL";
$param = array(
	"vbuNumber"	=> "771323",
	"systemID"	=> "Vigil",
	"username" 	=> "locationchecker",
	"password" 	=> "L0c@ti0nCh3ck3r",
	"errorCode"	=> ""
);

class MSSoapClient extends SoapClient {
	function __construct($wsdl, $options = null) {
     		parent::__construct($wsdl, $options);
  		}
	function __doRequest($request, $location, $action, $version) {
		$namespace = "http://tempuri.com/";

		$request = preg_replace('/<ns1:(\w+)/', '<$1 xmlns="'.$namespace.'"', $request, 1);
		$request = preg_replace('/<ns1:(\w+)/', '<$1', $request);
		$request = str_replace(array('/ns1:', 'xmlns:ns1="'.$namespace.'"'), array('/', ''), $request);

		$request = str_replace('<SOAP-ENV','<soap',$request);
		$request = str_replace('</SOAP-ENV','</soap',$request);
		$request = str_replace('xmlns:ns1="http://tempuri.org/"','',$request);
		$request = str_replace('xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/"',
				'xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"',$request);

		//echo "Request:".htmlspecialchars($request)." \n \n";
		// parent call
		return parent::__doRequest($request, $location, $action, $version);
	}
}

$client = new MSSoapClient($wsdl,array("location"=>'http://locationcheck.netstaronline.net/LocationChecker.asmx',
	"trace"	=> 1,
	"exceptions"	=> 0)); 
try {
    echo "<pre>\n";
print($client->GetVehicleLatestPos($param));
print "Request :\n".htmlspecialchars($client->__getLastRequest()) ."\n";
  	print "Response:\n".htmlspecialchars($client->__getLastResponse())."\n"; 
    echo "\n</pre>\n";
} catch (SoapFault $exception){
echo $exception;
}

?>

What the request should look like

<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
  <soap:Body>
    <GetVehicleLatestPos xmlns="http://tempuri.org/">
      <vbuNumber>string</vbuNumber>
      <systemID>string</systemID>
      <username>string</username>
      <password>string</password>
      <errorCode>string</errorCode>
    </GetVehicleLatestPos>
  </soap:Body>
</soap:Envelope>