Title: Receiving error message when editing theme
Last modified: August 19, 2016

---

# Receiving error message when editing theme

 *  Resolved [Anders Norén](https://wordpress.org/support/users/anlino/)
 * (@anlino)
 * [16 years, 6 months ago](https://wordpress.org/support/topic/receiving-error-message-when-editing-theme/)
 * I’m receiving the following error message when i try to update files in the theme
   editor(Edit: Or when I try to upload images, publish posts, etc.):
 * > Warning: Cannot modify header information – headers already sent by (output
   > started at C:\xampp\htdocs\wordpress\wp-includes\formatting.php:1) in C:\xampp\
   > htdocs\wordpress\wp-admin\theme-editor.php on line 69
 * Whereas line 69 consists of:
 * > header(“Location: $location”);
 * The files are still uppdated as usually, but I’d prefer not to have the error
   message appear. Does anyone have any idea about what could cause the error, and
   how I can fix it?
 * Thanks!

Viewing 2 replies - 1 through 2 (of 2 total)

 *  [s_ha_dum](https://wordpress.org/support/users/apljdi/)
 * (@apljdi)
 * [16 years, 6 months ago](https://wordpress.org/support/topic/receiving-error-message-when-editing-theme/#post-1285577)
 * The problem is at wp-includes/formatting.php line 1. Something is being echoed
   and it shouldn’t be. Try replacing that file with a clean copy.
 *  Thread Starter [Anders Norén](https://wordpress.org/support/users/anlino/)
 * (@anlino)
 * [16 years, 6 months ago](https://wordpress.org/support/topic/receiving-error-message-when-editing-theme/#post-1285600)
 * Ah, that did the trick. Thanks!

Viewing 2 replies - 1 through 2 (of 2 total)

The topic ‘Receiving error message when editing theme’ is closed to new replies.

## Tags

 * [error message](https://wordpress.org/support/topic-tag/error-message/)
 * [formatting.php](https://wordpress.org/support/topic-tag/formatting-php/)

 * In: [Fixing WordPress](https://wordpress.org/support/forum/how-to-and-troubleshooting/)
 * 2 replies
 * 2 participants
 * Last reply from: [Anders Norén](https://wordpress.org/support/users/anlino/)
 * Last activity: [16 years, 6 months ago](https://wordpress.org/support/topic/receiving-error-message-when-editing-theme/#post-1285600)
 * Status: resolved

## Topics

### Topics with no replies

### Non-support topics

### Resolved topics

### Unresolved topics

### All topics