From: Ben Dunlap on
> I followed this thread:
> "
> http://spikomoko.wordpress.com/2009/08/19/magento-not-working-on-php-5-3/
> ".
>
> But then, I'm bounched on this error in my webbrowser for visitting my
> magento on my production server desktop:
> "
> .:
> Fatal error: Call to a member function createDirIfNotExists() on a
> non-object in /var/www/html/magento/app/Mage.php on line 644

Sounds like your version of Magento isn't compatible with PHP 5.3 (and
perhaps less-recent releases also?).

Is there a newer version of Magento available?

Ben