scheduled task error

Hi,
when the scheduled task of
vBSEO Sitemap Generator
Generate sitemaps
runs, I get the following error:

Code:

Database error in vBulletin 4.0.1:

Invalid SQL:

               SELECT
                       count(*) as maxre
               FROM vb_tagthread
               GROUP BY tagid
               ORDER BY maxre DESC
               LIMIT 0,1;

MySQL Error   : Table 'forum.vb_tagthread' doesn't exist
Error Number  : 1146
Request Date  : Wednesday, January 27th 2010 @ 02:00:42 AM
Error Date    : Wednesday, January 27th 2010 @ 02:00:50 AM
Script        : http://.../forum/cron.php?rand=1264554039
Referrer      : http://.../forum//register.php?a=act&u=56477&i=65095f32e24e0c09580607b8895428ec5aa238c9
IP Address    : 216.127.61.160
Username      : Unregistered
Classname     : vB_Database
MySQL Version :

Hello,

Please make sure you are using sitemap 2.6 beta. 2.5 and lower are not compatible with vb4.

That was the why.
I upgraded to 2.6 and it runs fine now.
Thank you.