What does this database error mean? Please help!

[محروم.كوم]

Hi, I've been getting many of these database errors emailed to me about my site:

Quote:
Database error in vBulletin 3.8.4:

Invalid SQL:

SELECT
post.*, post.username AS postusername, post.ipaddress AS ip, IF(post.visible = 2, 1, 0) AS isdeleted,
user.*, userfield.*, usertextfield.*,
icon.title as icontitle, icon.iconpath,
avatar.avatarpath, NOT ISNULL(customavatar.userid) AS hascustomavatar, customavatar.dateline AS avatardateline,customavatar.width AS avwidth,customavatar.height AS avheight,



editlog.userid AS edit_userid, editlog.username AS edit_username, editlog.dateline AS edit_dateline,
editlog.reason AS edit_reason, editlog.hashistory,
postparsed.pagetext_html, postparsed.hasimages,
sigparsed.signatureparsed, sigparsed.hasimages AS sighasimages,
sigpic.userid AS sigpic, sigpic.dateline AS sigpicdateline, sigpic.width AS sigpicwidth, sigpic.height AS sigpicheight,
IF(displaygroupid=0, user.usergroupid, displaygroupid) AS displaygroupid, infractiongroupid
, '' AS field5
,helpfulpost.goodrank,helpfulpost.totalrank
FROM post AS post
LEFT JOIN user AS user ON(user.userid = post.userid)
LEFT JOIN userfield AS userfield ON(userfield.userid = user.userid)
LEFT JOIN usertextfield AS usertextfield ON(usertextfield.userid = user.userid)
LEFT JOIN icon AS icon ON(icon.iconid = post.iconid)
LEFT JOIN avatar AS avatar ON(avatar.avatarid = user.avatarid) LEFT JOIN customavatar AS customavatar ON(customavatar.userid = user.userid)


LEFT JOIN editlog AS editlog ON(editlog.postid = post.postid)
LEFT JOIN postparsed AS postparsed ON(postparsed.postid = post.postid AND postparsed.styleid = 3 AND postparsed.languageid = 1)
LEFT JOIN sigparsed AS sigparsed ON(sigparsed.userid = user.userid AND sigparsed.styleid = 3 AND sigparsed.languageid = 1)
LEFT JOIN sigpic AS sigpic ON(sigpic.userid = post.userid)
LEFT JOIN helpfulpost AS helpfulpost ON(helpfulpost.postid = post.postid)
WHERE post.postid IN (0,22990)
ORDER BY post.dateline;

MySQL Error : Got error 28 from storage engine
Error Number : 1030
Request Date : Thursday, May 20th 2010 @ 11:08:22 PM
Error Date : Thursday, May 20th 2010 @ 11:08:22 PM
Script : URL
Referrer :
IP Address : 119.63.198.83
Username : Unregistered
Classname : vB_Database
MySQL Version :

Does anyone know what this means? I'm kinda lost...thanks! __DEFINE_LIKE_SHARE__