xml - php with soap service -

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i need use xml file: http://www.mubashermisr.com/mubadelayed/service1.asmx?wsdl

to connect gettopgainers methode use code:

    <?php     ini_set("soap.wsdl_cache_enabled", "0"); // disabling wsdl cache     $wsdl_path = "http://www.mubashermisr.com/mubadelayed/service1.asmx?wsdl";      $parameters = array("username"=>"xxxx","password"=>"xxxx","id"=>"xxxxx");      $client = new soapclient($wsdl_path, array('trace' => 1));      try {     $result = $client->gettopgainers($parameters);     print_r($result);    }     catch (soapfault $exception) {     echo $exception;           }      ?>

but following error:

soapfault exception: [soap:server] server unable process request.      ---> object reference not set instance of object. in  c:\wamp\www\soap\soap.php:24 stack trace: #0  c:\wamp\www\soap\soap.php(24): soapclient->__call('gettopgainers', array)  #1 c:\wamp\www\soap\soap.php(24): soapclient->gettopgainers(array) #2  {main}

any appreciated. thanks

    <?php     ini_set("soap.wsdl_cache_enabled", "0"); // disabling wsdl cache     $wsdl_path = "url";      $parameters = array("username"=>"xxx","password"=>"xxx","id"=>"xxx");     $header = new soapheader('namespace', 'auth', $parameters);    $client = new soapclient($wsdl_path);     $client->__setsoapheaders($header);    try {     $topgainers = $client->gettopgainers(); // top gainers      echo"<pre>";     print_r($topgainers);     echo"</pre>";     }     catch (soapfault $exception) {     echo $exception;           }       ?>

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