How can I fix this? Error retrieving setting from database: forum_keyvalue is empty

I had created an OSQA before and it was working well. Then I decided to translate it to Turkish. After some translations I saw that not all of my changes affect QA. I searched for it and found that .po file is not synced with actual site and created new .po file. My changes started to affect the page, but then suddenly my Q&A crashed. There were some problem while fetching data from forum_keyvalue table. What I had in log file was rows like that and that caused Q&A to crash.

C:Python27Libsite-packagesforum2forumsettingsbase.py TIME: 2011-11-03 09:31:27,227 MSG: base.py:value:65 Error retrieving setting from database (USE_CUSTOM_HEAD): 'NoneType' object is not callable

I didnt understand why I couldnt get data from that table. I have created a new Q&A since I couldnt find any solution and now when I use commands "manage.py syncdb --all" and "manage.py migrate forum --fake" it creates all tables but forum_keyvalue table is not populated with any data. When I run the site I take the errors I wrote above again. It can't get settings. How can I populate this table? What is the problem here? It was working well before...