Thread:Project:Support desk/Upgraded from 1.17 to 1.19 getting the following error (2)/reply (6)

If you upgrade from the previous version, please follow the Upgrade file. e.g. you upload the whole new file 1.19 to existing one (e.g 1.16).

Then follow the steps in the "Upgrade" in your mediawiki-1.19.1.tar.gz

From the web
If you browse to the web-based installation script (usually at /mw-config/index.php) from your wiki installation you can follow the script and upgrade your database in place.