“Object reference not set to an instance of an object” error calling SOAP service from PHP

Question

I'm attempting to access this web service via SOAP from PHP using this code:

ini_set("soap.wsdl_cache_enabled", "0"); // disabling WSDL cache
$wsdl_path = "http://www.neugroup.com/workarea/servercontrolws.asmx?WSDL";

$username = 'username';
$password = 'password';

$client = new SoapClient($wsdl_path, array(
  "trace"      => 1,
  "exceptions" => 0)
);
try {
  $result = $client->LoadListSummary(array(
    'LangID' => 1033,
    'FolderPath' => 'path/',
    'MaxResults' => 500,
    'OrderKey' => 'Title',
    'Direction' => 'Ascending',
    'Preview' => 0,
    'Recursive' => 0,
    'RetrieveSummary' => 0,
    'Random' => 0,
    'GetHtml' => 0,
    'ContentType' => 'AllTypes',
    )
  );
}
catch (SoapFault $exception) {
  echo $exception;
}

but I get an "Object reference not set to an instance of an object" error. I'm stepping through this is a debugger, and I can see that $client is an object. Is there something else I'm doing wrong that would cause this error? Also, am I structuring my SOAP call correctly?

Thanks.

Answer 1

It doesn't look like you are doing anything wrong, the error is in the service so one of two things can be the case:

1. One of your parameters is wrong and makes the service resolve to a null object (path could be a candidate) and the server doesn't validate this and try to so operations on the object
2. There is a general malfunction in the service you are calling