WordPress 2.6.1 Errors when I try to update files in admin

I’ve upgraded to 2.6.1and when I try to add a post or page I get this error message…

======================
WordPress database error: [Table ‘maddh_wrdp1.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 ‘maddh_wrdp1.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/maddh/public_html/wp-includes/wp-db.php:517) in /home/maddh/public_html/wp-includes/pluggable.php on line 770

=========================

Any ideas?

Help!!!