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MyBB has experienced an internal SQL error and cannot continue.

SQL Error:
126 - Incorrect key file for table './alex4u_mybb/mybb_threads.MYI'; try to repair it
Query:
DELETE FROM mybb_threads WHERE tid='7727'

what to do pls let me know

now site is down now this is error

MyBB has experienced an internal SQL error and cannot continue.

SQL Error:
145 - Table './alex4u_mybb/mybb_threads' is marked as crashed and should be repaired
Query:
SELECT t.*, u.username FROM mybb_threads t LEFT JOIN mybb_users u ON (u.uid=t.uid) WHERE 1=1 AND t.visible='1' AND t.closed NOT LIKE 'moved|%' ORDER BY t.lastpost DESC LIMIT 0, 15

how to fix this

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can anybody pls reply the solution

Goto your PHPMyAdmin then open the database which needs to be repaired.
Select the table that need repair and choose the Repair table option from the drop-down menu at the bottom.