Call to a member function on a non-object in /usr/share/pear/DB.php on line 883

I'm transferring my PHP/PEAR written program from my dev machine (Windows XP) to web server, Linux (Mandrake 10.1) and have encountered a problem with PEAR which worked fine in windows.

If i give a simple run down of my problem I hope someone can help.

The error i'm getting is "Fatal error: Call to a member function on a non-object in /<folder>/<folder>/pear/DB.php on line 883"

The database object is made in a "require_once" file which happens at the top of every page.

$dsn = 'mysql://' . DB_Username . ':' . DB_Password . '@' . DB_Server . '/' . DB_Initial_Catalog . '';

$db = DB::connect ($dsn);

I also fill a ersult set at this point

$categories = $db->query('SELECT * FROM tblCategory WHERE catParentID = 0 AND catActive = 1');

The error is appearing in another "require_once" file when calling...

<code>
while ($cat =& $categories->fetchRow())
</code>

Anyone any ideas?

need more info?

Do you have all your ampersands in place (noticed they are missing in the connect and query methods).