Title: Headers already sent
Last modified: August 20, 2016

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# Headers already sent

 *  [jasonsweb](https://wordpress.org/support/users/jasonsweb/)
 * (@jasonsweb)
 * [13 years, 3 months ago](https://wordpress.org/support/topic/headers-already-sent-13/)
 * Hi,
 * When I activate the SEO plugin, I’m getting this error:
    `Warning: Cannot modify
   header information - headers already sent by (output started at /home/xxxxx/domains/
   xxxxx/public_html/themename/wp-admin/includes/template.php:1642) in /home/xxxxx/
   domains/xxxxx/public_html/themename/wp-includes/pluggable.php on line 876`
 * WordPress version: 3.5.1
    WordPress SEO version: 1.3.4.4
 * I’ve also tested it with a new and clean version of WordPress, with no plugins
   activated and with the twentytwelve theme. Same results with the error…
 * I’ve checked this thread, but don’t like to make changes to the WP core files.
   
   [http://wordpress.org/support/topic/yoast-seo-plugin-causing-my-website-to-break?replies=14](http://wordpress.org/support/topic/yoast-seo-plugin-causing-my-website-to-break?replies=14)
 * Any ideas what could fix this?
 * [http://wordpress.org/extend/plugins/wordpress-seo/](http://wordpress.org/extend/plugins/wordpress-seo/)

Viewing 4 replies - 1 through 4 (of 4 total)

 *  Thread Starter [jasonsweb](https://wordpress.org/support/users/jasonsweb/)
 * (@jasonsweb)
 * [13 years, 2 months ago](https://wordpress.org/support/topic/headers-already-sent-13/#post-3468584)
 * Nobody who has the same problem with the latest SEO plugin and WP version?
 *  [kxalex](https://wordpress.org/support/users/kxalex/)
 * (@kxalex)
 * [13 years, 2 months ago](https://wordpress.org/support/topic/headers-already-sent-13/#post-3468585)
 * same problem to me + can’t update titles
 *  [djflorfila](https://wordpress.org/support/users/djflorfila/)
 * (@djflorfila)
 * [13 years, 2 months ago](https://wordpress.org/support/topic/headers-already-sent-13/#post-3468586)
 * **I have this trouble too =(**
    Help pls!
 *  [John Doe](https://wordpress.org/support/users/borisvs/)
 * (@borisvs)
 * [13 years, 2 months ago](https://wordpress.org/support/topic/headers-already-sent-13/#post-3468593)
 * I’ve got the same problem too.
    Same error when I activate the plugin in 3.5

Viewing 4 replies - 1 through 4 (of 4 total)

The topic ‘Headers already sent’ is closed to new replies.

 * ![](https://ps.w.org/wordpress-seo/assets/icon-256x256.gif?rev=3419908)
 * [Yoast SEO - Advanced SEO with real-time guidance and built-in AI](https://wordpress.org/plugins/wordpress-seo/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/wordpress-seo/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/wordpress-seo/)
 * [Active Topics](https://wordpress.org/support/plugin/wordpress-seo/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/wordpress-seo/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/wordpress-seo/reviews/)

 * 4 replies
 * 4 participants
 * Last reply from: [John Doe](https://wordpress.org/support/users/borisvs/)
 * Last activity: [13 years, 2 months ago](https://wordpress.org/support/topic/headers-already-sent-13/#post-3468593)
 * Status: not resolved