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

---

# Cannot modify header information message

 *  [vessel65](https://wordpress.org/support/users/vessel65/)
 * (@vessel65)
 * [15 years, 5 months ago](https://wordpress.org/support/topic/cannot-modify-header-information-message/)
 * I’m using Cover WP 1.6.5 theme and it’s very nice. But when i’m facing following
   message everytime when i made some changes (e.g saving post, adding plug-in, 
   etc.,) please kindly advise.
 * Warning: Cannot modify header information – headers already sent by (output started
   at /home/content/77/7268677/html/wp-includes/class.wp-styles.php:86) in /home/
   content/77/7268677/html/wp-includes/functions.php on line 830
 * Warning: Cannot modify header information – headers already sent by (output started
   at /home/content/77/7268677/html/wp-includes/class.wp-styles.php:86) in /home/
   content/77/7268677/html/wp-includes/functions.php on line 831

Viewing 1 replies (of 1 total)

 *  Moderator [keesiemeijer](https://wordpress.org/support/users/keesiemeijer/)
 * (@keesiemeijer)
 * [15 years, 5 months ago](https://wordpress.org/support/topic/cannot-modify-header-information-message/#post-1862254)
 * Have you tried:
 * – switching to the default theme to rule out any theme-specific problems?
    – 
   deactivating **all** plugins to see if this resolves the problem? If this works,
   re-activate the plugins one by one until you find the problematic plugin(s).
 * If all that doesn’t help try this solution:
    [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)

Viewing 1 replies (of 1 total)

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

 * In: [Fixing WordPress](https://wordpress.org/support/forum/how-to-and-troubleshooting/)
 * 1 reply
 * 2 participants
 * Last reply from: [keesiemeijer](https://wordpress.org/support/users/keesiemeijer/)
 * Last activity: [15 years, 5 months ago](https://wordpress.org/support/topic/cannot-modify-header-information-message/#post-1862254)
 * Status: not resolved

## Topics

### Topics with no replies

### Non-support topics

### Resolved topics

### Unresolved topics

### All topics