help with drupal Vb

hallo everybody

need some help with this model Drupal Vb

when i activated it

i get this message

# user warning: Table 'ajwb_vb.vb_setting' doesn't exist query: SELECT varname, value FROM vb_setting in /home/ajwb/public_html/s/modules/drupalvb/drupalvb.inc.php on line 268.
# user warning: Table 'ajwb_vb.vb_thread' doesn't exist query: SELECT t.threadid, t.title, t.replycount, t.dateline AS created, t.postuserid AS userid, t.postusername AS name FROM vb_thread t INNER JOIN vb_forum f ON f.forumid = t.forumid WHERE f.showprivate = 0 AND t.lastpost >= 1258917662 ORDER BY t.dateline DESC LIMIT 5 in /home/ajwb/public_html/s/includes/database.mysql.inc on line 128

can any one till me how to fix this

thank you