Title: 2.3.1 Upgrade Error: Database Headers
Last modified: August 18, 2016

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# 2.3.1 Upgrade Error: Database Headers

 *  [mitchellwfox](https://wordpress.org/support/users/mitchellwfox/)
 * (@mitchellwfox)
 * [18 years, 7 months ago](https://wordpress.org/support/topic/231-upgrade-error-database-headers/)
 * I recently upgraded from 2.3 to 2.3.1 following the upgrade instructions provided
   on this site. Nevertheless, I occasionally get an error when working within the
   WP-Admin page (note – the site seems to be working fine otherwise).
 * Any thoughts?
 * ****
 * WordPress database error: [Table ‘db20074_strategyfox.wp_post2cat’ doesn’t exist]
   
   SELECT c.cat_name FROM wp_post2cat p2c INNER JOIN wp_categories c ON p2c.category_id
   = c.cat_id WHERE p2c.post_id = 74
 * WordPress database error: [Table ‘db20074_strategyfox.wp_post2cat’ doesn’t exist]
   
   SELECT c.cat_name FROM wp_post2cat p2c INNER JOIN wp_categories c ON p2c.category_id
   = c.cat_id WHERE p2c.post_id = 74
 * WordPress database error: [Table ‘db20074_strategyfox.wp_post2cat’ doesn’t exist]
   
   SELECT c.cat_name FROM wp_post2cat p2c INNER JOIN wp_categories c ON p2c.category_id
   = c.cat_id WHERE p2c.post_id = 74
 * Warning: Cannot modify header information – headers already sent by (output started
   at /mnt/gs02/herd02/20074/domains/thestrategyfox.com/html/wp-includes/wp-db.php:
   160) in /mnt/gs02/herd02/20074/domains/thestrategyfox.com/html/wp-includes/pluggable.
   php on line 391

Viewing 1 replies (of 1 total)

 *  [Kafkaesqui](https://wordpress.org/support/users/kafkaesqui/)
 * (@kafkaesqui)
 * [18 years, 7 months ago](https://wordpress.org/support/topic/231-upgrade-error-database-headers/#post-651143)
 * [http://wordpress.org/support/topic/135564](http://wordpress.org/support/topic/135564)
 * Try disabling your plugins, specifically any that deal with categories and/or
   the admin pages.

Viewing 1 replies (of 1 total)

The topic ‘2.3.1 Upgrade Error: Database Headers’ is closed to new replies.

## Tags

 * [database](https://wordpress.org/support/topic-tag/database/)
 * [header](https://wordpress.org/support/topic-tag/header/)
 * [upgrade](https://wordpress.org/support/topic-tag/upgrade/)

 * In: [Installing WordPress](https://wordpress.org/support/forum/installation/)
 * 1 reply
 * 2 participants
 * Last reply from: [Kafkaesqui](https://wordpress.org/support/users/kafkaesqui/)
 * Last activity: [18 years, 7 months ago](https://wordpress.org/support/topic/231-upgrade-error-database-headers/#post-651143)
 * Status: not resolved

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