Title: PHP Warning
Last modified: August 24, 2016

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# PHP Warning

 *  [markkaz](https://wordpress.org/support/users/markkaz/)
 * (@markkaz)
 * [11 years, 1 month ago](https://wordpress.org/support/topic/php-warning-57/)
 * PHP Warning: Cannot modify header information – headers already sent by (output
   started at /home/xxxx/public_html/wp-content/plugins/all-in-one-seo-pack/aioseop_class.
   php:1476) in /home/xxxx/public_html/wp-includes/pluggable.php on line 947
 * [https://wordpress.org/plugins/all-in-one-seo-pack/](https://wordpress.org/plugins/all-in-one-seo-pack/)

Viewing 1 replies (of 1 total)

 *  [Peter Baylies](https://wordpress.org/support/users/pbaylies/)
 * (@pbaylies)
 * [11 years, 1 month ago](https://wordpress.org/support/topic/php-warning-57/#post-6137459)
 * Hi markkaz,
 * This shouldn’t be happening; you can try disabling force rewrites under Performance
   and see if that helps you to further track down where the error is coming from.
   But the referenced line of code should be running at wp_head and flushing output
   buffers, which should not be running before pluggable.php is loaded. This could
   be due to a conflict with another plugin or with your theme as well.

Viewing 1 replies (of 1 total)

The topic ‘PHP Warning’ is closed to new replies.

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 * 1 reply
 * 2 participants
 * Last reply from: [Peter Baylies](https://wordpress.org/support/users/pbaylies/)
 * Last activity: [11 years, 1 month ago](https://wordpress.org/support/topic/php-warning-57/#post-6137459)
 * Status: not resolved