SOAP set_relationship between case and Contact

[sugarsgo]

Hi , im building a small PHP app and im trying to create a link between a Case and a Contact.
I can open the connection, and I create the case, but when I create the relationship I get:

[name] => Module Does Not Exist [description] => This module is not available on this server

The code im using to create it is:

$myRelation = array(
    	'module1' => 'Cases', 
    	'module1_id' => $case->id, 
    	'module2' => 'Contacts', 
    	'module2_id' => $contactID);

$link=$gCRMSOAPclient->set_relationship($gCRMSOAPsession,$myRelation);

There is obviously something wrong on it, but can anyone tell me what is it?

thanks a lot in advance?

[kbrill]

Is this SOAP or REST and what version of either are you using? The version is in the directory path to the entry point you are using.