Problem when trying to get a Custom Attribute with Connect for PHP V1

I'm hoping you guys can help me with a major problem when i try to get a Custom Attribute using the Connect for PHP API V1 (November 2011 release). I have created a Custom Object (named TipoContingencia) who acts as a parent of a primary Object (Incident),  so i created a relationship between these 2 objects and i named the FK as tc_id (in the Incident table). I make the query to access to this data according to the November 2011 documentation (http://documentation.custhelp.com/euf/assets/devdocs/november2011/developer/Connect_PHP/Content/Connect%20for%20PHP%20API/RightNow%20Object%20Query%20Language/ROQL%20and%20Custom%20Objects.htm#ROQL) but it brings me an error (error code 0) " Failed: Unknown table or column 'CustomAttributes'" and i even used a document i found where it's explained how to do this kind of query, but nothing works. I tried to do the same steps described on the documentation using the C# SOAP API and it worked perfectly, actually that field works fine everywhere excepting PHP and i really don't know what can it be.

 

As i say before i'm using the Connect API V1 with a november 2011 console.

 

Thank you for your help!