Title: Cannot modify headers
Last modified: August 18, 2020

---

# Cannot modify headers

 *  Resolved [soosoio](https://wordpress.org/support/users/soosoio/)
 * (@soosoio)
 * [5 years, 9 months ago](https://wordpress.org/support/topic/debug-18/)
 * This came up for debug. Not sure what to do with this. Did notice that user password
   change cannot be saved and several actions lead to a page that says critical 
   error and action not completed.
 *     ```
       WARNING: wp-admin/includes/misc.php:1310 - Cannot modify header information - headers already sent by (output started at /home/dh_zmfmfy/comeback.world/wp-content/advanced-cache.php:22)
       require_once('wp-admin/admin.php'), do_action('admin_init'), WP_Hook->do_action, WP_Hook->apply_filters, wp_admin_headers, header
   
       WARNING: wp-admin/admin-header.php:9 - Cannot modify header information - headers already sent by (output started at /home/dh_zmfmfy/comeback.world/wp-content/advanced-cache.php:22)
       require_once('wp-admin/admin-header.php'), header
       ```
   
    -  This topic was modified 5 years, 9 months ago by [Jan Dembowski](https://wordpress.org/support/users/jdembowski/).
      Reason: Moved to Fixing WordPress, this is not an Everything else WordPress
      topic
 * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Fdebug-18%2F%3Foutput_format%3Dmd&locale=en_US)
   to see the link]_

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

 *  [Suresh Shinde](https://wordpress.org/support/users/suresh-shinde/)
 * (@suresh-shinde)
 * [5 years, 9 months ago](https://wordpress.org/support/topic/debug-18/#post-13273459)
 * There is Advance cache plugin setting WP_CACHE in wp-config.php file check the
   line as;
 * define(‘WP_CACHE’, true);
 * below is the statement which need to be commented like
 * // define(‘WP_CACHE’, is_file(__DIR__.’/wp-content/advanced-cache.php’));
 * to prevent this error you can set to false, like
 * define(‘WP_CACHE’, false);
    -  This reply was modified 5 years, 9 months ago by [Suresh Shinde](https://wordpress.org/support/users/suresh-shinde/).
 *  Thread Starter [soosoio](https://wordpress.org/support/users/soosoio/)
 * (@soosoio)
 * [5 years, 9 months ago](https://wordpress.org/support/topic/debug-18/#post-13278747)
 * Problem solved! Thank you!

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

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

 * In: [Fixing WordPress](https://wordpress.org/support/forum/how-to-and-troubleshooting/)
 * 2 replies
 * 2 participants
 * Last reply from: [soosoio](https://wordpress.org/support/users/soosoio/)
 * Last activity: [5 years, 9 months ago](https://wordpress.org/support/topic/debug-18/#post-13278747)
 * Status: resolved

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