Weird Error

[ravenfaust]

Hi i am getting this error:
Warning: mysql_query() [function.mysql-query]: Unable to save result set in [path]/includes/class_core.php on line 408

Database error in vBulletin 3.8.4:

Invalid SQL:

SELECT thread.lastposter, thread.lastpost, thread.views, thread.open, thread.forumid, thread.replycount, thread.threadid, thread.pollid, thread.title, user.username, user.userid, user.usergroupid, IF(displaygroupid=0, user.usergroupid, displaygroupid) AS displaygroupid FROM thread as thread
LEFT JOIN user AS user ON (user.username = thread.lastposter) ORDER BY lastpost DESC LIMIT 0, 5;

MySQL Error : Table 'thread' is marked as crashed and should be repaired
Error Number : 1194
Request Date : Thursday, March 11th 2010 @ 06:22:18 AM
Error Date : Thursday, March 11th 2010 @ 06:22:19 AM

Classname : vB_Database
MySQL Version : 5.0.89-community

i tried using PHPMy admin to repair and still nothing..

Any ideas?