why do I get this error message

2.31 version still, maybe this is why I get this error.

what can I do about this and why am I getting this error messsge every time I post. this site looks fine and posts get posted.

WordPress database error: [Table ‘informc8_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 ‘informc8_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/informc8/public_html/wasfatman/wp-includes/wp-db.php:160) in /home/informc8/public_html/wasfatman/wp-includes/pluggable.php on line 391