Fatal error: Cannot re-assign $this

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Full subject line: "Fatal error: Cannot re-assign $this in ... UMA-mysql.inc.php on line 673"

Hi,

I searched this forum, but didn't see a solution to this problem. One person had a similar issue with UMA-pgsql.inc.php, but there was no resolution there (http://sourceforge.net/forum/message.php?msg_id=3602469).

I am using this on a unix based system and if I install everything as it is, it does not work because uma/mysql/mepath.php has the contents:
.:../../conf:../../classes:
which will never work because conf and classes are at the same level as uma/mysql

I changed these paths and got the following error when trying to access http://mysite.com/uma/mysql/

Fatal error: Cannot re-assign $this in /.../mysite/public/classes/UMA-mysql.inc.php on line 673

This is the relevant code... Why is this not working?

660    class user extends mObject {       
661        function user($username = FALSE, $user_id = FALSE) {       
662        if ($username || $user_id) {   
663            $uma = new UMA();   
664            $uma->connect();   
665            if ($username) {   
666            $sql = "SELECT * FROM uma_client WHERE username='$username'";
667            } elseif ($user_id) {   
668            $sql = "SELECT * FROM uma_client WHERE id = '$user_id'";
669            }   
670            $uma->query($sql);   
671            $objectData = $uma->fetch();   
672            if ($objectData->id) {   
673            $this = $uma->loadObject($objectData, new user());
674            }   
675        }   
676        }