MyBB SQL Error

MyBB has experienced an internal SQL error and cannot continue.

SQL Error:
144 - Table './lg/mybb_posts' is marked as crashed and last (automatic?) repair failed
Query:
SELECT message, edittime, tid, fid, pid FROM mybb_posts WHERE pid IN(1147775,1147770,1147741,1147739,1147689,1147688,1147647,1147644,1147630,1147607,1147605,1147594,1147592,1147581,1147580) ORDER BY dateline DESC