y este error? mmmm

hola amigos
de vez en cuando en mi pagina aparece este error:

Database error in vBulletin 4.0.3:

Invalid SQL:

SELECT languageid,
phrasegroup_global AS phrasegroup_global,
phrasegroup_vbanonymizer AS phrasegroup_vbanonymizer,
options AS lang_options,
languagecode AS lang_code,
charset AS lang_charset,
locale AS lang_locale,
imagesoverride AS lang_imagesoverride,
dateoverride AS lang_dateoverride,
timeoverride AS lang_timeoverride,
registereddateoverride AS lang_registereddateoverride,
calformat1override AS lang_calformat1override,
calformat2override AS lang_calformat2override,
logdateoverride AS lang_logdateoverride,
decimalsep AS lang_decimalsep,
thousandsep AS lang_thousandsep
FROM language
WHERE languageid = 2;

MySQL Error : Unknown column 'phrasegroup_vbanonymizer' in 'field list'
Error Number : 1054
Request Date : Tuesday, May 18th 2010 @ 02:23:02 PM
Error Date : Tuesday, May 18th 2010 @ 02:23:02 PM
Script : http://www.join2fun.com.ar/foros/red...ismochile.html
Referrer :
IP Address : 66.249.65.147
Username :
Classname : vB_Database
MySQL Version :

Que sera? es grave?

saludos a todos