$criteria->addAsColumn(“lastRow”, MAX(self::ID)); gives error

[helloise]

i have this code:

 

    static public function getLastNewMessage($profile_id)

    {

        $c = new Criteria();

        $subSelect = "rc_message_box_table.profile_id_from NOT IN ( SELECT rc_blocklist_table.profile_id_block  FROM  rc_blocklist_table WHERE  profile_id = $profile_id  ) and rc_message_box_table.profile_id_to=$profile_id and opened_once = 0";

        $c->add(self::PROFILE_ID_TO, $subSelect, Criteria::CUSTOM);

        $c->addAsColumn("lastRow", MAX(self::ID));

        //$subSelect2 = "max(rc_message_box_table.id)";

        //$c->add(self::ID, $subSelect2, Criteria::CUSTOM);

        return self::doSelect($c);

    }   

 

and get this error:

 

    500 | Internal Server Error | PropelException [wrapped: SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'AS lastRow FROM rc_message_box_table` WHERE rc_message_box_table.profile_id_fro' at line 1]

 

 

i just want the record of MAX(auto-increment-field) on the rc_message_box_table and this field is ID

i have tried the commented out lines as well but nothing works. i dont know how to achieve this..please help?

thank you