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...