forumun birçok yerinde bu hataları almaya başladık,nasıl düzenliyebiliriz,sebebi nedir ?

şimdiden teşekkürler ..

Database error in vBulletin 3.8.4: 

Invalid SQL: 

        SELECT post.userid 
        FROM post AS post 
        WHERE threadid = 125583 
            AND visible = 1 
             
        ORDER BY dateline DESC 
        LIMIT 1; 

MySQL Error   : Table './xxxx_vbulletin1/post' is marked as crashed and last (automatic?) repair failed 
Error Number  : 144 
Request Date  : Friday, March 5th 2010 @ 03:23:44 AM 
Error Date    : Friday, March 5th 2010 @ 03:23:44 AM 
Script        : http://www.siteadi.com.com/member.php?find=lastposter&f=118 
Referrer      : http://www.siteadi.com/index.php 
IP Address    : 81.214.66.136 
Username      : _SoN_ 
Classname     : vB_Database 
MySQL Version : 5.1.30