Title: Cannot modify header information
Last modified: August 22, 2016

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# Cannot modify header information

 *  [Levi071](https://wordpress.org/support/users/levi071/)
 * (@levi071)
 * [11 years, 9 months ago](https://wordpress.org/support/topic/cannot-modify-header-information-89/)
 * For Some Reason On A [Jigoshop](http://wordpress.org/plugins/jigoshop/) Page 
   It Won’t Work And Just Comes Up With:
 * **Warning**: Cannot modify header information – headers already sent by (output
   started at C:\xampp\htdocs\Clients\Richard Johnson\Paintball\wp-includes\theme.
   php:1338) in **C:\xampp\htdocs\Clients\Richard Johnson\Paintball\wp-includes\
   pluggable.php** on line **1121**

Viewing 1 replies (of 1 total)

 *  [RossMitchell](https://wordpress.org/support/users/rossmitchell/)
 * (@rossmitchell)
 * [11 years, 9 months ago](https://wordpress.org/support/topic/cannot-modify-header-information-89/#post-5241564)
 * This “Headers already sent” error means that output from the php code has already
   started, and hence it is too late to change cookies. This most often because 
   of a bug in your theme or one of your plugins, even something as simple as a 
   change of a php file from ending:
    `?>(EOF)` to
 *     ```
       ?>
       (EOF)
       ```
   
 * is enough to do this. It will have output an end of line !
 * So this is what you do:
    First backup your theme and plugins files. Reload a 
   clean copy of your theme files. Turn off all your plugins, or reload your plugins.
 * Hopefully you will now have identify where the problem started.

Viewing 1 replies (of 1 total)

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

 * In: [Localhost Installs](https://wordpress.org/support/forum/localhost-installs/)
 * 1 reply
 * 2 participants
 * Last reply from: [RossMitchell](https://wordpress.org/support/users/rossmitchell/)
 * Last activity: [11 years, 9 months ago](https://wordpress.org/support/topic/cannot-modify-header-information-89/#post-5241564)
 * Status: not resolved

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