Title: WordPress error while doing post
Last modified: August 18, 2016

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# WordPress error while doing post

 *  [donaldlimdotcom](https://wordpress.org/support/users/donaldlimdotcom/)
 * (@donaldlimdotcom)
 * [18 years, 10 months ago](https://wordpress.org/support/topic/wordpress-error-while-doing-post/)
 * Hi
    I was using wordpress software on my blog and when i tried to do a post, 
   it got the error below:
 * WordPress database error: [Duplicate entry ‘2’ for key 1]
    INSERT INTO wp_post2cat(
   post_id, category_id) VALUES (’35’, ‘5’)
 * Warning: Cannot modify header information – headers already sent by (output started
   at /home/secrets6/public_html/donaldlim/wp-includes/wp-db.php:133) in /home/secrets6/
   public_html/donaldlim/wp-includes/pluggable.php on line 329
 * It was working fine until I installed a few plugins. But I am unsure which plugins
   or something else caused the error.
 * The new post gets posted but it does not appear in any categories even though
   I have indicated which categories the new post shld be in. It get posted in the
   Uncategorize category although this category no longer exist on my blog.
 * Can some expert advise me on this please?
    Thank.

The topic ‘WordPress error while doing post’ is closed to new replies.

## Tags

 * [new post error](https://wordpress.org/support/topic-tag/new-post-error/)
 * [WordPress Error](https://wordpress.org/support/topic-tag/wordpress-error/)

 * 0 replies
 * 1 participant
 * Last reply from: [donaldlimdotcom](https://wordpress.org/support/users/donaldlimdotcom/)
 * Last activity: [18 years, 10 months ago](https://wordpress.org/support/topic/wordpress-error-while-doing-post/)
 * Status: not resolved

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