Discuz! Database Error

The database has encountered a problem. Need Help?

Error messages:

[Type] 查询语句错误 [145] Table './ivocaloid/forum_post' is marked as crashed and should be repaired [Query] SELECT p.* FROM forum_post p WHERE p.tid='474926' AND p.invisible='0' ORDER BY p.dateline LIMIT 0, 26

Program messages:

[Line: 0060]forum.php(require) [Line: 0519]source/module/forum/forum_viewthread.php(DB::query)

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