منتدى استراحات زايد - Forum Db error when use search

I have Database error when use search, vbulletin send to me two mail for one error:

Database error in vBulletin 4.2.0:

Invalid SQL:

SELECT searchgroup.groupid, MATCH(searchgroup_text.title) AGAINST ('documento per la cgil vvf') AS score
FROM vb_searchgroup AS searchgroup JOIN vb_searchgroup_text AS searchgroup_text ON
(searchgroup.searchgroupid = searchgroup_text.searchgroupid)

WHERE MATCH(searchgroup_text.title) AGAINST ('documento per la cgil vvf') AND
searchgroup.contenttypeid = 2

HAVING score > 4
LIMIT 5;

MySQL Error : Can't find FULLTEXT index matching the column list
Error Number : 1191
Request Date : Sunday, January 27th 2013 @ 11:08:22 AM
Error Date : Sunday, January 27th 2013 @ 11:08:23 AM
Script : http://www.fncvvf.it/fncvvf/newthrea...ostthread&f=68
Referrer : http://www.fncvvf.it/fncvvf/newthrea...newthread&f=68
IP Address : 151.75.52.109
Username : grisu81_f
Classname : vB_Database
MySQL Version :

Database error in vBulletin 4.2.0:

Invalid SQL:

SELECT searchgroup.groupid, MATCH(searchgroup_text.title) AGAINST ('documento per la cgil vvf') AS score
FROM vb_searchgroup AS searchgroup JOIN vb_searchgroup_text AS searchgroup_text ON
(searchgroup.searchgroupid = searchgroup_text.searchgroupid)

WHERE MATCH(searchgroup_text.title) AGAINST ('documento per la cgil vvf') AND
searchgroup.contenttypeid = 2

HAVING score > 4
LIMIT 5;

MySQL Error : Can't find FULLTEXT index matching the column list
Error Number : 1191
Request Date : Sunday, January 27th 2013 @ 11:08:30 AM
Error Date : Sunday, January 27th 2013 @ 11:08:30 AM
Script : http://www.fncvvf.it/fncvvf/newthrea...ostthread&f=68
Referrer : http://www.fncvvf.it/fncvvf/newthrea...newthread&f=68
IP Address : 151.75.52.109
Username : grisu81_f
Classname : vB_Database
MySQL Version :