MyBB SQL Error

MyBB has experienced an internal SQL error and cannot continue.

SQL Error:
144 - Table './forum@002dpets@002dinfo/mybb_posts' is marked as crashed and last (automatic?) repair failed
Query:
SELECT p.pid, p.uid, p.fid, p.visible, p.message, t.tid, t.subject, t.visible AS thread_visible FROM mybb_posts p LEFT JOIN mybb_threads t ON (t.tid=p.tid) WHERE p.pid IN (27571) AND p.fid NOT IN (91,113,108,56,55,39,96,105,95,80,128) AND p.visible='1' AND t.visible='1'

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