Upgraded to 4.0 but errors occur when logging out

[jessiegoh]

Hi there

I thought I have successfully upgraded to 4.0 (and indeed everything looks perfect on the outside www.savemoneysydney.com.au) but when I log out of the admin, I get these strings of errors:



WordPress database error: [Table 'sav0907409452142.wp_sfmembers' doesn't exist]
SELECT checktime FROM wp_sfmembers WHERE user_id = 1

WordPress database error: [Table 'sav0907409452142.wp_sfmembers' doesn't exist]
UPDATE wp_sfmembers SET lastvisit = '' WHERE user_id=1

WordPress database error: [Table 'sav0907409452142.wp_sftrack' doesn't exist]
DELETE FROM wp_sftrack WHERE trackuserid=1

WordPress database error: [Table 'sav0907409452142.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/content/j/e/s/jessiegoh/html/wp-includes/wp-db.php:587) in /home/content/j/e/s/jessiegoh/html/wp-includes/pluggable.php on line 865

Can someone please let me know what is going on and more importantly how I'll be able to fix it? Thanks