Thread:Project:Support desk/upgrade problems: 1.11 -- 1.21

I'm trying to upgrade from MW 1.11 to 1.21.0rc5, using PHP 5.3.13 and MySQL 5.0.96-log. I get the following error during the upgrade:

The wiki in question is at: http://wikihawk.heggen.net

I am kinda stumped, so any help would be appreciated.