Discuz! Database Error

The database has encountered a problem. Need Help?

Error messages:

[Type] 查询语句错误 [145] Table './reasonclub_rcbbs/forum_thread' is marked as crashed and should be repaired [Query] SELECT * FROM forum_thread WHERE tid='12555' LIMIT 1

Program messages:

[Line: 0053]forum.php(loadforum) [Line: 0450]source/function/function_forum.php(get_thread_by_tid) [Line: 0591]source/function/function_forum.php(DB::fetch_first)

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