Title: Cannot Modify Header Infromation Error
Last modified: August 24, 2016

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# Cannot Modify Header Infromation Error

 *  Resolved [techmann](https://wordpress.org/support/users/techmann/)
 * (@techmann)
 * [11 years ago](https://wordpress.org/support/topic/cannot-modify-header-infromation-error/)
 * When I click proceed to Paypal Express after all items have been added to cart,
   i get the following error,
 * “Warning: Cannot modify header information – headers already sent by (output 
   started at /home/threebe9/public_html/store/wp-content/themes/mystile-child/functions.
   php:46) in /home/threebe9/public_html/store/wp-includes/pluggable.php on line
   1196”
 * I literally cannot move past this error. What could be causing this?
 * [https://wordpress.org/plugins/paypal-for-woocommerce/](https://wordpress.org/plugins/paypal-for-woocommerce/)

Viewing 8 replies - 1 through 8 (of 8 total)

 *  Plugin Contributor [angelleye](https://wordpress.org/support/users/angelleye/)
 * (@angelleye)
 * [11 years ago](https://wordpress.org/support/topic/cannot-modify-header-infromation-error/#post-6159151)
 * There must be some plugin or something in the theme with extra space in the code,
   which is what causes this particular error quite a bit.
 * Can you try disabling other plugins to see if the problem goes away? Then re-
   enable them one at a time until you find the culprit?
 *  Thread Starter [techmann](https://wordpress.org/support/users/techmann/)
 * (@techmann)
 * [11 years ago](https://wordpress.org/support/topic/cannot-modify-header-infromation-error/#post-6159153)
 * Thanks for the quick reply! Unfortunately it is still not working even with all
   plugins disabled except for woocommerce and your plugin.
 *  Plugin Contributor [angelleye](https://wordpress.org/support/users/angelleye/)
 * (@angelleye)
 * [11 years ago](https://wordpress.org/support/topic/cannot-modify-header-infromation-error/#post-6159154)
 * The only other thing might be the theme then. Can you try one of the basic “twenty”
   themes?
 * Just trying to figure out what’s unique with your setup because I have not had
   this complaint from anybody else.
 *  Thread Starter [techmann](https://wordpress.org/support/users/techmann/)
 * (@techmann)
 * [11 years ago](https://wordpress.org/support/topic/cannot-modify-header-infromation-error/#post-6159155)
 * Yeah I’m having other issues with the site today as well such as you add an item
   to cart and then go to the cart page and it says the cart is empty. Something
   must have really gotten screwed up
 *  Thread Starter [techmann](https://wordpress.org/support/users/techmann/)
 * (@techmann)
 * [11 years ago](https://wordpress.org/support/topic/cannot-modify-header-infromation-error/#post-6159160)
 * SO I activated the mystile parent theme instead of the child (which I was using)
   and everything works perfectly which means there is no plugin conflict. Do you
   know how I could best troubleshoot the child theme? I really would like all my
   personal customizations back.
 *  Plugin Contributor [angelleye](https://wordpress.org/support/users/angelleye/)
 * (@angelleye)
 * [11 years ago](https://wordpress.org/support/topic/cannot-modify-header-infromation-error/#post-6159162)
 * One of the pages in your child theme must have some extra white space between
   some lines.
 * Take a look at [the answer here](http://stackoverflow.com/questions/8028957/how-to-fix-headers-already-sent-error-in-php)
   for details on the problem and how to troubleshoot it.
 *  Thread Starter [techmann](https://wordpress.org/support/users/techmann/)
 * (@techmann)
 * [11 years ago](https://wordpress.org/support/topic/cannot-modify-header-infromation-error/#post-6159189)
 * Fixed it, there was an empty line after the closing tag in my child’s functions.
   php
 *  Plugin Contributor [angelleye](https://wordpress.org/support/users/angelleye/)
 * (@angelleye)
 * [11 years ago](https://wordpress.org/support/topic/cannot-modify-header-infromation-error/#post-6159191)
 * That’ll do it. Glad you got it worked out!

Viewing 8 replies - 1 through 8 (of 8 total)

The topic ‘Cannot Modify Header Infromation Error’ is closed to new replies.

 * ![](https://s.w.org/plugins/geopattern-icon/paypal-for-woocommerce_dce4f5.svg)
 * [PayPal for WooCommerce](https://wordpress.org/plugins/paypal-for-woocommerce/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/paypal-for-woocommerce/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/paypal-for-woocommerce/)
 * [Active Topics](https://wordpress.org/support/plugin/paypal-for-woocommerce/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/paypal-for-woocommerce/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/paypal-for-woocommerce/reviews/)

 * 8 replies
 * 2 participants
 * Last reply from: [angelleye](https://wordpress.org/support/users/angelleye/)
 * Last activity: [11 years ago](https://wordpress.org/support/topic/cannot-modify-header-infromation-error/#post-6159191)
 * Status: resolved