How To Fix Database error in vBulletin 4.2.0 for new thread or new nreply ?

[nomoreturn]

How i can fix this Database error it came up when we submit a new thread or new reply i disable plugin and try and still have this error please help me to fix this thanks

:

Invalid SQL:
INSERT INTO vb_searchcore_text (searchcoreid, title, keywordtext)
VALUES ( 51, 'Admin اِیڈمن', '' )
ON DUPLICATE KEY UPDATE searchcoreid = VALUES(searchcoreid), title = VALUES(title), keywordtext = VALUES(keywordtext);

MySQL Error : Table './mast***_so**/vb_searchcore_text' is marked as crashed and should be repaired
Error Number : 145
Request Date : Thursday, July 12th 2012 @ 06:11:11 PM
Error Date : Thursday, July 12th 2012 @ 06:11:11 PM
Script : http://www.mastdunya.com/newreply.ph...streply&t=2880
Referrer : http://www.mastdunya.com/newreply.ph...streply&t=2880
IP Address : **.**.**.**
Username : admin
Classname : vB_Database
MySQL Version : 5.1.63-cll