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

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# Warning: Cannot modify header information Error

 *  [caputodesignz](https://wordpress.org/support/users/caputodesignz/)
 * (@caputodesignz)
 * [11 years, 3 months ago](https://wordpress.org/support/topic/warning-cannot-modify-header-information-error-3/)
 * I have seen multiple threads with this issue, but never saw the resolution. I
   didn’t change any code but all of a sudden I am receiving this error:
 *     ```
       exists##Product already in the wishlist.
       Warning: Cannot modify header information - headers already sent by (output started at /home/neccoas/public_html/rcaputo/crowdshop/wp-content/plugins/yith-woocommerce-wishlist/yith-wcwl-ajax.php:47) in /home/neccoas/public_html/rcaputo/crowdshop/wp-includes/pluggable.php on line 1178
       ```
   
 * Is there a fix for this issue? Any help would really be appreciated.
 * [https://wordpress.org/plugins/yith-woocommerce-wishlist/](https://wordpress.org/plugins/yith-woocommerce-wishlist/)

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

 *  Plugin Author [YITHEMES](https://wordpress.org/support/users/yithemes/)
 * (@yithemes)
 * [11 years, 3 months ago](https://wordpress.org/support/topic/warning-cannot-modify-header-information-error-3/#post-5774618)
 * Hi caputodesignz,
 * do you have this issue with the latest version of YITH Woocommerce Wishlist ?
 *  [Rodolfo Melogli](https://wordpress.org/support/users/businessbloomer/)
 * (@businessbloomer)
 * [11 years, 3 months ago](https://wordpress.org/support/topic/warning-cannot-modify-header-information-error-3/#post-5774681)
 * I used to get the same with version 2.0.2:
 * Warning: Cannot modify header information – headers already sent by (output started
   at /usr/local/pem/vhosts/291969/webspace/httpdocs/xxxxxxx/wp-includes/plugin.
   php:885) in /usr/local/pem/vhosts/291969/webspace/httpdocs/xxxxxxx/wp-content/
   plugins/yith-woocommerce-wishlist/includes/functions.yith-wcwl.php on line 149
 * Now the error is gone, but I get another one (v. 2.0.3):
 * Notice: yith_wcwl_products cookie cannot be set – headers already sent by /usr/
   local/pem/vhosts/291969/webspace/httpdocs/xxxxxxx/wp-includes/plugin.php on line
   885 in /usr/local/pem/vhosts/291969/webspace/httpdocs/xxxxxxx/wp-content/plugins/
   woocommerce/includes/wc-core-functions.php on line 548
 *  Plugin Author [YITHEMES](https://wordpress.org/support/users/yithemes/)
 * (@yithemes)
 * [11 years, 3 months ago](https://wordpress.org/support/topic/warning-cannot-modify-header-information-error-3/#post-5774682)
 * Hi BusinessBloomer,
 * can you please post a link where we can check the problem? Have you tried disabling
   other plugins you’re using on your wordpress installation?
 * It seems someone prints unexpected output before wishlist plugin can set its 
   cookie
 * Let us know 🙂

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

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

 * ![](https://ps.w.org/yith-woocommerce-wishlist/assets/icon-128x128.gif?rev=3129302)
 * [YITH WooCommerce Wishlist](https://wordpress.org/plugins/yith-woocommerce-wishlist/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/yith-woocommerce-wishlist/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/yith-woocommerce-wishlist/)
 * [Active Topics](https://wordpress.org/support/plugin/yith-woocommerce-wishlist/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/yith-woocommerce-wishlist/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/yith-woocommerce-wishlist/reviews/)

 * 3 replies
 * 3 participants
 * Last reply from: [YITHEMES](https://wordpress.org/support/users/yithemes/)
 * Last activity: [11 years, 3 months ago](https://wordpress.org/support/topic/warning-cannot-modify-header-information-error-3/#post-5774682)
 * Status: not resolved