Database Error 28

This error just popped up sometime this morning on my site:
SQL/DB Error:
Got error 28 from table handler
SELECT DISTINCT * FROM b2posts WHERE 1=1 AND post_date <= ‘2004-03-12 12:57:40’ AND (post_status = “publish”) GROUP BY b2posts.ID ORDER BY post_date DESC LIMIT 8
I wasn’t messing wth anything, so it seems to have happened on it’s own. Any ideas? It’s messing up my site https://kitta.net big time.