Title: Major Upgrading Errors
Last modified: August 18, 2016

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# Major Upgrading Errors

 *  [theshadowfan](https://wordpress.org/support/users/theshadowfan/)
 * (@theshadowfan)
 * [18 years, 6 months ago](https://wordpress.org/support/topic/major-upgrading-errors/)
 * I tried to upgrade to 2.3 today and now I’ve run into a ton of errors.
 * My child categories have disappeared and only the parent remains.
 * Here’s one that I get on the front page:
 * WordPress database error: [Table ‘stuffwel_wrdp3.wp_categories’ doesn’t exist]
   
   SELECT cat_name FROM wp_categories ORDER BY cat_name ASC
 * Then when I go to post, I get this message:
 * WordPress database error: [Table ‘stuffwel_wrdp3.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 ‘stuffwel_wrdp3.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/stuffwel/public_html/stuffwelike/wp-includes/wp-db.php:160) in /home/
   stuffwel/public_html/stuffwelike/wp-includes/pluggable.php on line 391
 * Any idea how to fix these?
 * My blog is [http://www.stuffwelike.com/stuffwelike](http://www.stuffwelike.com/stuffwelike)
 * Thanks!

Viewing 2 replies - 1 through 2 (of 2 total)

 *  [MichaelH](https://wordpress.org/support/users/michaelh/)
 * (@michaelh)
 * [18 years, 6 months ago](https://wordpress.org/support/topic/major-upgrading-errors/#post-651139)
 * Please review this thread:
    [http://wordpress.org/support/topic/135564?replies=78](http://wordpress.org/support/topic/135564?replies=78)
 * You likely have an incompatible theme or plugin.
 *  Thread Starter [theshadowfan](https://wordpress.org/support/users/theshadowfan/)
 * (@theshadowfan)
 * [18 years, 6 months ago](https://wordpress.org/support/topic/major-upgrading-errors/#post-651155)
 * Thanks I was able to fix it all!

Viewing 2 replies - 1 through 2 (of 2 total)

The topic ‘Major Upgrading Errors’ is closed to new replies.

 * In: [Fixing WordPress](https://wordpress.org/support/forum/how-to-and-troubleshooting/)
 * 2 replies
 * 2 participants
 * Last reply from: [theshadowfan](https://wordpress.org/support/users/theshadowfan/)
 * Last activity: [18 years, 6 months ago](https://wordpress.org/support/topic/major-upgrading-errors/#post-651155)
 * Status: not resolved

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