Database error - Help if you can :)

[UrGonnaDie]

Hello everyone im getting like 30 emails with errors like this below. I recently moved my site from one hosting company to another i think that is the cause but even though im getting db errors its not affecting my site from working.
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Database error in vBulletin 4.0.8:

Invalid SQL:
SELECT SQL_CALC_FOUND_ROWS node.nodeid AS itemid ,(node.nodeleft = 1) AS isroot, node.nodeid, node.contenttypeid, node.contentid, node.url, node.parentnode, node.styleid, node.userid,
node.layoutid, node.publishdate, node.setpublish, node.issection, parent.permissionsfrom as parentpermissions,
node.showrating,
node.permissionsfrom, node.publicpreview, node.shownav, node.hidden, node.nosearch , info.description, info.title, info.viewcount, info.creationdate, info.workflowdate,
info.workflowstatus, info.workflowcheckedout, info.workflowlevelid, info.associatedthreadid,
user.username, sectionorder.displayorder


FROM cms_node AS node
INNER JOIN cms_nodeinfo AS info ON info.nodeid = node.nodeid
LEFT JOIN user AS user ON user.userid = node.userid
LEFT JOIN cms_sectionorder AS sectionorder ON sectionorder.sectionid = node.parentnode
AND sectionorder.nodeid = node.nodeid
LEFT JOIN cms_node AS parent ON parent.nodeid = node.parentnode

WHERE node.new != 1 AND node.nodeid IN (45,5,11,2,3,1) AND ( (node.permissionsfrom IN (1)) OR (node.userid =1) OR ( node.permissionsfrom in (1,5) AND (node.parentnode IN (1) OR node.nodeid = 1) AND
node.setpublish > 0 AND node.publishdate < 1297602378 ))AND node.new != 1

ORDER BY CASE WHEN sectionorder.displayorder > 0 THEN sectionorder.displayorder ELSE 9999999 END ASC,
node.publishdate DESC;

MySQL Error : Can't create/write to file '/tmp/#sql_6760_0.MYI' (Errcode: 28)
Error Number : 1
Request Date : Sunday, February 13th 2011 @ 07:06:18 AM
Error Date : Sunday, February 13th 2011 @ 07:06:18 AM
Script : http://www.justpurefun.com/
Referrer :
IP Address : 208.54.161.219
Username : UrGonnaDie
Classname : vB_Database
MySQL Version : 5.0.91-community