Thread:Project:Support desk/Database error in upgrading from 1.18 to 1.22/reply (3)

The interesting part in that message is:

Function: WikiPage::pageData Error: 1054 Unknown column 'page_content_model' in 'field list' (jainwikiuser.db.7394013.hostedresource.com)

The updater obviously expects the column "page_content_model" to be in your database, but it is not. As afirst step, I would take a backup of the database and just try the update again.

If that does not help, have a look at this thread, where the same problem has been discussed. Basically some hack to add and remove the column at the start of the update... This is actually not the same problem, sorry.