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(1147780,1147779,1147772,1147769,1147767,1147766,1147757,1147756,1147752,1147745,1147744,1147738,1147736,1147729,1147728) ORDER BY dateline DESC