Title: cannot modify header warning??
Last modified: August 19, 2016

---

# cannot modify header warning??

 *  Resolved [tracyrosen](https://wordpress.org/support/users/tracyrosen/)
 * (@tracyrosen)
 * [16 years, 10 months ago](https://wordpress.org/support/topic/cannot-modify-header-warning/)
 * What is this?
 * `Warning: Cannot modify header information - headers already sent by (output 
   started at /home/trac7032/public_html/leadingfromtheheart.org/wp-content/themes/
   scrapbook/functions.php:36) in /home/trac7032/public_html/leadingfromtheheart.
   org/wp-includes/pluggable.php on line 865`
 * All of a sudden this morning I get this error each time I make any kind of modification
   to my blog (add a new post, activate/deactivate plugins).
 * For example, I made a new post. Through the writing, as it refreshed, this warning
   would appear in pink below the content input box. Then I clicked publish and 
   was brought to a page that had only the warning at the top of it, nothing else.
   But then if I retype in my blog address, the post is posted.
 * When I try to deactivate a plugin, I am brought to the warning page. If I renavigate
   to the plugin page, I see that the plugin is indeed deactivated.
 * Is this a 2.8.4 thing?
 * It coincided with an All in one SEO plugin update. I deactivated it, but it is
   still happening.

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

 *  [hedonplay](https://wordpress.org/support/users/hedonplay/)
 * (@hedonplay)
 * [16 years, 10 months ago](https://wordpress.org/support/topic/cannot-modify-header-warning/#post-1179017)
 * Many people make this mistake when they modified the function.php
    The following
   article makes a clear explanation.
 * [http://www.hui-wang.info/2009/07/warning-cannot-modify-header-information-headers-already-sent/](http://www.hui-wang.info/2009/07/warning-cannot-modify-header-information-headers-already-sent/)
 *  [doc4](https://wordpress.org/support/users/doc4/)
 * (@doc4)
 * [16 years, 10 months ago](https://wordpress.org/support/topic/cannot-modify-header-warning/#post-1179020)
 * tracyrosen,
 * Try this: Open the wp-config.php and remove all spaces before “<?php” and after“?
   >” Upload and replace. As noted on this site: [http://www.hongkiat.com/blog/wordpress-error-warning-cannot-modify-header-information/](http://www.hongkiat.com/blog/wordpress-error-warning-cannot-modify-header-information/)
 *  Thread Starter [tracyrosen](https://wordpress.org/support/users/tracyrosen/)
 * (@tracyrosen)
 * [16 years, 10 months ago](https://wordpress.org/support/topic/cannot-modify-header-warning/#post-1179262)
 * Thank you! It was indeed a white space problem and is now fixed.

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

The topic ‘cannot modify header warning??’ is closed to new replies.

## Tags

 * [headers](https://wordpress.org/support/topic-tag/headers/)
 * [warning](https://wordpress.org/support/topic-tag/warning/)

 * In: [Fixing WordPress](https://wordpress.org/support/forum/how-to-and-troubleshooting/)
 * 3 replies
 * 3 participants
 * Last reply from: [tracyrosen](https://wordpress.org/support/users/tracyrosen/)
 * Last activity: [16 years, 10 months ago](https://wordpress.org/support/topic/cannot-modify-header-warning/#post-1179262)
 * Status: resolved

## Topics

### Topics with no replies

### Non-support topics

### Resolved topics

### Unresolved topics

### All topics