That's odd... I'm running 2.2.9 on both my personal site, and another server I use just to test things and have never had an error like that. If you would like to send me a copy of your modified admin/functions.php file I'll be glad to take a look and see if I can find the problem. If you'd like to send it, use the address
plurplanet@hotmail.com. I'm in the process of moving servers right now, so my regular email address isn't working at the moment.