Error on logout WordPress database error:

My installation works OK, but on logging out I get this message:-

WordPress database error: [Table ‘sunrise_wrdp1.wp_sfmembers’ doesn’t exist]
SELECT checktime FROM wp_sfmembers WHERE user_id = 1

WordPress database error: [Table ‘sunrise_wrdp1.wp_sfmembers’ doesn’t exist]
UPDATE wp_sfmembers SET lastvisit = ” WHERE user_id=1

WordPress database error: [Table ‘sunrise_wrdp1.wp_sftrack’ doesn’t exist]
DELETE FROM wp_sftrack WHERE trackuserid=1

WordPress database error: [Table ‘sunrise_wrdp1.wp_sfmembers’ doesn’t exist]
UPDATE wp_sfmembers SET newposts = ‘a:1:{i:0;i:0;}’ WHERE user_id=1

Warning: Cannot modify header information – headers already sent by (output started at /home/sunrise/public_html/wp-includes/wp-db.php:517) in /home/sunrise/public_html/wp-includes/pluggable.php on line 850

Can anyone offer any advice?

Thank you