database error

[matcom gsm]

i have this error in this forum

Database error in vBulletin 3.8.4:

Invalid SQL:

SELECT COUNT(post.dateline) AS postcount, post.userid, user.userid, user.username, user.lastpostid, user.posts, user.usergroupid,
IF(displaygroupid=0, usergroupid, displaygroupid) AS displaygroupid
FROM post AS post
JOIN user AS user ON (post.userid = user.userid)


WHERE dateline > 1323126000
GROUP BY post.userid
ORDER BY postcount DESC
LIMIT 5;

MySQL Error : Table './matcom_forum/post' is marked as crashed and should be repaired
Error Number : 145
Request Date : Tuesday, December 6th 2011 @ 10:03:19 AM
Error Date : Tuesday, December 6th 2011 @ 10:03:21 AM
Script : http://www.matcomgsm.com/index.php
Referrer :
IP Address : 41.155.64.37
Username : MatCom Gsm
Classname : vB_Database
MySQL Version : 5.1.56

and my adcmincp work how will i solve this step by step b ecause im a beginer thanks in advance

[Lynne]

Your post table has crashed. Go to Maintenance > Repair/Optimize tables > select the post table and repair/optimize it. You may have to do this a couple of times until it says OK.

[matcom gsm]

it work for me thanks but can you tell me how this happen and how nto prevent it in future

[Zachery]

It shouldn't have happened, and there is no way for your as a normal user to prevent it.