Database error after upgrading from 2.2 to 2.3

After upgrading I get this in the “manage” section:

WordPress database error: [Table ‘mattsthe_wrdp1.wp_post2cat’ doesn’t exist]
SELECT SQL_CALC_FOUND_ROWS DISTINCT wp_posts.* FROM wp_posts LEFT JOIN wp_post2cat ON ( wp_posts.ID = wp_post2cat.post_id) WHERE 1=1 AND post_type = ‘post’ AND (post_status = ‘publish’ OR post_status = ‘future’ OR post_status = ‘draft’ OR post_status = ‘pending’ OR post_status = ‘private’) ORDER BY post_date DESC LIMIT 0, 15

Can anyone help?