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I tried to upgrade my MyBB 1.2.10 Installation to MyBB 1.4.4. I followed the instructions step by step but when I click next in the upgrade process I get the following message:

Fatal error: [SQL] [1054] Unknown column 'isdefault' in 'where clause'
SELECT name,sid FROM mybb_settings WHERE isdefault='1' OR isdefault='yes' in /var/www/web506/html/proline-forum-test/inc/db_mysql.php on line 544

I don't know a lot about PHP and MySQL so I need help to know what this error means and how to fix it.

Here is the phpInfo:

http://test.proline-forum.de/phpinfo.php

Maybe some of the vital funktions are blocked?
nobody!?