Title: Cannot modify header information
Last modified: August 30, 2016

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# Cannot modify header information

 *  [peggysue4u](https://wordpress.org/support/users/peggysue4u/)
 * (@peggysue4u)
 * [10 years, 8 months ago](https://wordpress.org/support/topic/cannot-modify-header-information-108/)
 * I know there are lots of people who had the same problem but all the solutions
   I found, didn’t seem to work. I’m getting the following message:
 * Warning: Cannot modify header information – headers already sent by (output started
   at /var/www/vhosts/okashinederland.com/httpdocs/index.php:2) in /var/www/vhosts/
   okashinederland.com/httpdocs/wp-includes/pluggable.php on line 1207
 * This happens ONLY when I click on ‘Inspiration Tuesday’ under ‘blog’. I don’t
   really get it. I’ve tried to disable and enable the plugins and checked different.
   php files for extra spaces, etc. But nothing helped.
 * Any suggestions?

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

 *  Moderator [t-p](https://wordpress.org/support/users/t-p/)
 * (@t-p)
 * [10 years, 8 months ago](https://wordpress.org/support/topic/cannot-modify-header-information-108/#post-6563905)
 * – Try reviewing this codex to solve header already sent problem: [http://codex.wordpress.org/FAQ_Troubleshooting#How_do_I_solve_the_Headers_already_sent_warning_problem.3F](http://codex.wordpress.org/FAQ_Troubleshooting#How_do_I_solve_the_Headers_already_sent_warning_problem.3F)
 *  Thread Starter [peggysue4u](https://wordpress.org/support/users/peggysue4u/)
 * (@peggysue4u)
 * [10 years, 8 months ago](https://wordpress.org/support/topic/cannot-modify-header-information-108/#post-6563907)
 * I’ve tried that, but there are no blank lines or spaces in the code. In fact,
   nothing seems off in the code
 *  Moderator [t-p](https://wordpress.org/support/users/t-p/)
 * (@t-p)
 * [10 years, 8 months ago](https://wordpress.org/support/topic/cannot-modify-header-information-108/#post-6563915)
 * If that did not help, then try:
    – Flushing any caching plugins you might be 
   running, as well as server and/or browser caches. Also, any op cache or content
   network cache, as well as Cloudflare, clear those caches. – deactivating ALL (
   yes all) plugins temporarily to see if this resolves the problem (plugin functions
   can interfere). If this works, re-activate them individually (one-by-one) to 
   find the problematic plugin(s). – switching to the unedited default Twenty Fifteen
   theme for a moment using the WP dashboard to rule out any theme-specific issue(
   theme functions can interfere like plugins).
 *  Thread Starter [peggysue4u](https://wordpress.org/support/users/peggysue4u/)
 * (@peggysue4u)
 * [10 years, 8 months ago](https://wordpress.org/support/topic/cannot-modify-header-information-108/#post-6563939)
 * I’m now getting the following: 
    Fatal error: Cannot redeclare wp_cache_add()(
   previously declared in /var/www/vhosts/okashinederland.com/httpdocs/wp-includes/
   cache.php:24) in /var/www/vhosts/okashinederland.com/httpdocs/wp-includes/formatting.
   php on line 29

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

The topic ‘Cannot modify header information’ is closed to new replies.

## Tags

 * [header](https://wordpress.org/support/topic-tag/header/)
 * [Modify](https://wordpress.org/support/topic-tag/modify/)
 * [troubleshooting](https://wordpress.org/support/topic-tag/troubleshooting/)

 * In: [Fixing WordPress](https://wordpress.org/support/forum/how-to-and-troubleshooting/)
 * 4 replies
 * 2 participants
 * Last reply from: [peggysue4u](https://wordpress.org/support/users/peggysue4u/)
 * Last activity: [10 years, 8 months ago](https://wordpress.org/support/topic/cannot-modify-header-information-108/#post-6563939)
 * Status: not resolved

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