Frustrating error with get_relationships()

[cthan323]

I am trying to use the get_relationships() SOAP method. When I run the following code, I get a Fatal Error: Class 'stu_Assigned_Evaluation' not found in /path/to/SugarSoapUsers.php on line 1055. What am I doing wrong? Will $soapyEval2 evaluate to false if nothing is returned?

 $soapyEval2 = $client->call('get_relationships', array('session' => $session_id,
                                                       'module_name' => 'stu_Student',
                                                       'module_id' => $id,
                                                       'related_module' => 'stu_Assigned_Evaluation',
                                                       'related_module_query' => '',
                                                       'delete' => 0
                                                       ));
echo '<pre>';
var_dump($soapyEval2);
echo '</pre>';
 
echo $client->request;
echo '<br />';
echo $client->response;