Database problem

I am getting the following message each time I make a post to the blog. It went like that after I upgraded the installation – maybe the last time or the time before that.

Word press is still working for me – the post goes in and the site is working but this message is bugging me loads.

Anyone with ideas of how I can recticfy the problem

WordPress database error: [Table ‘user_440780.wp_post2cat’ doesn’t exist]
SELECT cat_ID AS ID, MAX(post_modified) AS last_mod FROM wp_posts p LEFT JOIN wp_post2cat pc ON p.ID = pc.post_id LEFT JOIN wp_categories c ON pc.category_id = c.cat_ID WHERE post_status = ‘publish’ GROUP BY cat_ID

WordPress database error: [Table ‘user_440780.wp_post2cat’ doesn’t exist]
SELECT cat_ID AS ID, MAX(post_modified) AS last_mod FROM wp_posts p LEFT JOIN wp_post2cat pc ON p.ID = pc.post_id LEFT JOIN wp_categories c ON pc.category_id = c.cat_ID WHERE post_status = ‘publish’ GROUP BY cat_ID

Warning: Cannot modify header information – headers already sent by (output started at /home/content/w/i/z/wizardgold/html/wordpress/wp-includes/wp-db.php:160) in /home/content/w/i/z/wizardgold/html/wordpress/wp-includes/pluggable.php on line 391

I have had success upgrading other word press installations , only this one is giving me this problem.

Thanks