Problema urgente con vbulletin y mysql error code 28

Database error in vBulletin 4.0.3:
Invalid SQL:
SELECT user.userid, user.username, user.usertitle,
COUNT(post.postid) AS postcount
FROM user
LEFT JOIN post
ON post.userid=user.userid
AND dateline>'1272690000'
WHERE usergroupid=2
GROUP BY user.userid
ORDER BY postcount DESC
LIMIT 5;
MySQL Error : Error writing file '/tmp/MYElpfUN' (Errcode: 28)
Error Number : 3
Request Date : Monday, May 31st 2010 @ 08:38:17 PM
Error Date : Monday, May 31st 2010 @ 08:43:11 PM
Script : xxxxxxxxxxxxxxxxxxxxxxxxx
Referrer : xxxxxxxxxxxxxxxxxxxxxxxxx
IP Address : 187.149.136.229
Username : No Registrado
Classname : vB_Database
MySQL Version : 5.1.45

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Invalid SQL:
SELECT user.userid, user.username, user.usertitle,
COUNT(post.postid) AS postcount
FROM user
LEFT JOIN post
ON post.userid=user.userid
AND dateline>'1275368400'
WHERE usergroupid=2
GROUP BY user.userid
ORDER BY postcount DESC
LIMIT 5;
MySQL Error : Clave de archivo erronea para la tabla: '/tmp/#sql_f06_20.MYI'; intente repararlo
Error Number : 126

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Database error in vBulletin 4.0.3:

Invalid SQL:

SELECT searchcore.searchgroupid, searchgroup.dateline

FROM searchcore AS searchcore

JOIN searchcore_text AS searchcore_text ON (searchcore_text.searchcoreid = searchcore.searchcoreid)

JOIN searchgroup AS searchgroup ON (searchgroup.searchgroupid = searchcore.searchgroupid)

WHERE MATCH(searchcore_text.title, searchcore_text.keywordtext) AGAINST ('+BusinessCards +\\\"3.99\\\"' IN BOOLEAN MODE);

MySQL Error : Tabla './nombre de la base/

searchcore_text' está marcada como crashed y la última reparación (automactica?) falló

Error Number : 144

Request Date : Wednesday, June 2nd 2010 @ 01:32:48 AM

Error Date : Wednesday, June 2nd 2010 @ 01:32:51 AM

Script : XXXXXXXXXXXXXXXXXXXXXXXX/search.php?do=process

Referrer : XXXXXXXXXXXXXXXXXXXXXXXX/list.php?category/7-Software

IP Address : 189.168.181.198

Username : AKRON

Classname : vB_Database

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Database error in vBulletin 4.0.3:

Invalid SQL:

SELECT thread.threadid, thread.title, thread.prefixid, post.attach,
thread.postusername, thread.dateline, thread.lastpostid, thread.lastpost, thread.lastposterid, thread.lastposter, thread.replycount,
forum.forumid, forum.title_clean as forumtitle,
post.pagetext AS message, post.allowsmilie, post.postid,
user.*
,avatar.avatarpath, NOT ISNULL(customavatar.userid) AS hascustomavatar, customavatar.dateline AS avatardateline,customavatar.width AS avwidth,customavatar.height AS avheight
FROM thread AS thread
INNER JOIN forum AS forum ON(forum.forumid = thread.forumid)
LEFT JOIN post AS post ON (post.postid = thread.firstpostid)
LEFT JOIN user AS user ON (thread.postuserid = user.userid)
LEFT JOIN avatar AS avatar ON(avatar.avatarid = user.avatarid) LEFT JOIN customavatar AS customavatar ON(customavatar.userid = user.userid)
WHERE 1=1
AND thread.forumid IN(3,4,14,15,27,83,34,10,20,87,88,89,90,91,92,93,94,95,48,100,18,63,107,108,64,65,97,98,19,76,77,78,79,12,45,21,44,99,22,49,29,96,13,71,72,73,31,47,28,41,5,53,67,68,69,74,75,16,51,50,52,86,17,70,33,80,81,82,30,6,23,101,102,103,104,24,62,40,25,54,60,55,35,7,26,84,85,106,43,59,58,32,61,56,57,66,9,109,39,105,11,46)
AND thread.visible = 1
AND post.visible = 1
AND open <> 10
AND thread.dateline > 1272870705


ORDER BY thread.views DESC
LIMIT 0,5;

MySQL Error : Error writing file '/tmp/MYAwAo0i' (Errcode: 28)
Error Number : 3
Request Date : Wednesday, June 2nd 2010 @ 02:11:45 AM
Error Date : Wednesday, June 2nd 2010 @ 02:11:45 AM

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