I've been searching around on Google for a while found a few there all related to Wordpress Plugins going wrong or out of date, so try disabling and updating your plugins.

Search that in Google.

WordPress database error: [Can't find FULLTEXT index matching the column list]

This is one that I found pretty useful, sounds like alot of people have it too.

http://forums.digitalpoint.com/showthread.php?t=187500

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