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"Unable to Load Format Class" Error on Upgrade to Joomla 3.3



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 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`



Author: Alexis Priddy Categories: Joomla Installation

About the Author

Alexis Priddy

Alexis Priddy

Alexis moved to Waco in 2008 after five years in the United States Army as a military police officer.  Web design was a hobby that grew into a passionwhile she was in the military.  She is the founder of, a reference website for Army personnel that averages over 25,000 unique visitors a month.  When she sold that website to a national marketing firm, she decided to venture out and start YellowWebMonkey Web Design in 2009.  She has a Bachelor of Science degree in Psychology and Computer Science Engineering from the United States Military Academy at West Point, NY.