Session cookie cannot be sent – headers already sent by wordpress/wp-includes/functions.php:3457

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by

Florian

First of all, I am sorry for causing this trouble. But I am totally lost ..

I work with Theme Divi 2.5 from elegantthemes, WooCommerce (German Version) and Gravity Forms – and, of course, Affiliates Pro.

On the site, the submission of forms need to be tracked. But the tracking does not work at all. I run the debug-scheme and as a result I got the following message:

[09-Sep-2015 13:43:58 UTC] PHP Warning: session_start(): Cannot send session cookie – headers already sent by (output started at /homepages/36/d528632959/htdocs/matcharevolution/wordpress/wp-includes/functions.php:3457) in /homepages/36/d528632959/htdocs/matcharevolution/wordpress/wp-content/themes/Divi/header.php on line 1

The site is www.matcharevolution.com.

What can I do?

Bet regards from Germany,
Florian

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Comments

One response to “Session cookie cannot be sent – headers already sent by wordpress/wp-includes/functions.php:3457”

  1. antonio Avatar
    antonio

    Hi Florian,
    you can try to disable Affiliates plugin and check if the error persist.
    If it continues, it can be a conflict with your theme or another plugin. You could try to create a ‘test’ copy of your website and activate the default wordpress theme and enable only the essential plugins.
    Kind regards,
    Antonio B.

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