“Unable to Load Format Class” Error on Upgrade to Joomla 3.3

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As of right now, we are unsure of the cause of this error, but have had it occur on about 10% of upgrades so far.  Here are the steps to get you back live again:

1. Go to Joomla.org and download the full package of 3.2.4:


2. Using FTP, upload all of package, except the /installation/ folder

3. Once done, go to your /cache/ folder and delete all files except index.html

4. Go to phpmyadmin and delete all rows in SESSIONS table (example, DELETE FROM `jos_session`



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YellowWebMonkey Web design offers reliable website design, SEO and digital marketing services for Joomla, WordPress and Shopify sites. We strive to be a one-stop shop for all your web needs.

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