Title: Warning: Cannot modify header information
Last modified: August 19, 2016

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# Warning: Cannot modify header information

 *  Resolved [Dmitrik](https://wordpress.org/support/users/dmitrik/)
 * (@dmitrik)
 * [18 years, 6 months ago](https://wordpress.org/support/topic/warning-cannot-modify-header-information-8/)
 * Well, I just installed WordPress yesterday.
    Added a few plugins and a theme…
   then RSS feed stopped working and now gives this error:
 * Warning: Cannot modify header information – headers already sent by (output started
   at …/public_html/index.php:10) in …/public_html/wp-includes/feed-rss2.php on 
   line 2
    [http://dmitri.ws](http://dmitri.ws) A Personal Escape Location Of Dmitri
   K. Sun, 09 Dec 2007 20:11:08 +0000 [http://wordpress.org/?v=2.3.1](http://wordpress.org/?v=2.3.1)
   en [http://dmitri.ws/2007/12/08/welcome-to-wordpress/](http://dmitri.ws/2007/12/08/welcome-to-wordpress/)
   [http://dmitri.ws/2007/12/08/welcome-to-wordpress/#comments](http://dmitri.ws/2007/12/08/welcome-to-wordpress/#comments)
   Sat, 08 Dec 2007 12:50:45 +0000 Dmitri K. [http://dmitri.ws/2007/12/08/welcome-to-wordpress/](http://dmitri.ws/2007/12/08/welcome-to-wordpress/)
   [http://dmitri.ws/2007/12/08/welcome-to-wordpress/feed/](http://dmitri.ws/2007/12/08/welcome-to-wordpress/feed/)
 * I thought it’s template or some plugin not working properly, so I went through
   all of them… disabled them all and went back to original theme, still same problem.
 * Any help figuring what’s causing this?

Viewing 3 replies - 1 through 3 (of 3 total)

 *  [moshu](https://wordpress.org/support/users/moshu/)
 * (@moshu)
 * [18 years, 6 months ago](https://wordpress.org/support/topic/warning-cannot-modify-header-information-8/#post-664637)
 * Start here (no guarantee but it might help)
    [http://validator.w3.org/check?verbose=1&uri=http%3A%2F%2Fdmitri.ws%2F](http://validator.w3.org/check?verbose=1&uri=http%3A%2F%2Fdmitri.ws%2F)
 *  Thread Starter [Dmitrik](https://wordpress.org/support/users/dmitrik/)
 * (@dmitrik)
 * [18 years, 6 months ago](https://wordpress.org/support/topic/warning-cannot-modify-header-information-8/#post-664739)
 * Thanks.
    It seems I lost some files when uploading the theme or plugins.
 * I now uprgaded to PHP 5 and well, reinstalled whole WP.
 * /Solved.
 * P.S. Markup Validation is Valid now 🙂
 *  [fragileheart](https://wordpress.org/support/users/fragileheart/)
 * (@fragileheart)
 * [18 years, 2 months ago](https://wordpress.org/support/topic/warning-cannot-modify-header-information-8/#post-664855)
 * I know this issue is resolved, but I just wanted to add another scenario:
 * I recently tried to add a favicon to my blog and it caused some havoc on my RSS
   feeds. I had placed the favicon link (below) in my wp-blog-header.php:
 * <link rel=”shortcut icon” href=”URL for your favicon”>
 * and kept getting a similar error everytime you tried to access my RSS feeds. 
   It took me about 45 minutes to figure it out but the validator really helps! 
   Thanks 🙂

Viewing 3 replies - 1 through 3 (of 3 total)

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

## Tags

 * [header](https://wordpress.org/support/topic-tag/header/)
 * [RSS](https://wordpress.org/support/topic-tag/rss/)

 * In: [Fixing WordPress](https://wordpress.org/support/forum/how-to-and-troubleshooting/)
 * 3 replies
 * 3 participants
 * Last reply from: [fragileheart](https://wordpress.org/support/users/fragileheart/)
 * Last activity: [18 years, 2 months ago](https://wordpress.org/support/topic/warning-cannot-modify-header-information-8/#post-664855)
 * Status: resolved

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