Title: Cannot send session cookie/cache/header in session_start(). Last modified: August 30, 2016 --- # Cannot send session cookie/cache/header in session_start(). * Resolved [WPAdminJoe](https://wordpress.org/support/users/wpadminjoe/) * (@wpadminjoe) * [10 years, 11 months ago](https://wordpress.org/support/topic/cannot-send-session-cookiecacheheader-in-session_start/) * I just added new functionality to my site which works fine on the development site (Windows 7) but fails with the messages below on production (Linux Webm401. xx). * Warning: session_start(): Cannot send session cookie – headers already sent Warning: session_start(): Cannot send session cache limiter – headers already sent Warning: Cannot modify header information – headers already sent by * (output started at /home/wordpress/wp-includes/class.wp-scripts.php:180) in / administration/index.php on line2 * Based on my research of the problem, everything seems to point to un-readable characters in class.wp-scripts.php which was never modified. I have insured that my new code does not contain any un-readable characters. * The only modules modified within WP are: - Functions.php in the child theme (added Admin Bar main/sub menu options) - wp-config.php (added a variable to the end of the file) - The addition of a new page. * Functions and wp-config were modified using Notepad++ and have an encoding of UTF-8 without BOM. * Why would I have a problem within the class.wp-scripts.php core file? * Any ideas? * Thankx Viewing 6 replies - 1 through 6 (of 6 total) * Thread Starter [WPAdminJoe](https://wordpress.org/support/users/wpadminjoe/) * (@wpadminjoe) * [10 years, 10 months ago](https://wordpress.org/support/topic/cannot-send-session-cookiecacheheader-in-session_start/#post-6327022) * Hello, * Still hoping someone can help with this error as I cannot integrate another application into the WP Administration panel. * The errors are: Warning: session_start(): Cannot send session cookie – headers already sent (output started at /home/wordpress/wp-includes/class.wp-scripts. php:180) in /administration/index.php on line 2 * Warning: session_start(): Cannot send session cache limiter – headers already sent(output started at /home/wordpress/wp-includes/class.wp-scripts.php:180) in /administration/index.php on line 2 * Warning: Cannot modify header information – headers already sent by (output started at /home/wordpress/wp-includes/class.wp-scripts.php:180) in /administration/index. php on line 26 * **All pointing to the class.wp-scripts.php core file** * Anyone? Configuration problem perhaps? * Thanx, Joe * [Denzel Chia](https://wordpress.org/support/users/denzel_chia/) * (@denzel_chia) * [10 years, 10 months ago](https://wordpress.org/support/topic/cannot-send-session-cookiecacheheader-in-session_start/#post-6327028) * Hi, * Why don’t you try re-installing WordPress? And try using servers that are WordPress recommended? [https://wordpress.org/about/requirements/](https://wordpress.org/about/requirements/) * Perhaps subscribing a WordPress friendly web hosting is much easier to handle. * I have never encountered your error. * Thanks! * Thread Starter [WPAdminJoe](https://wordpress.org/support/users/wpadminjoe/) * (@wpadminjoe) * [10 years, 10 months ago](https://wordpress.org/support/topic/cannot-send-session-cookiecacheheader-in-session_start/#post-6327030) * Hello Denzel; * I certainly am not going to perform a reinstall of WordPress each time a glitch occurs within the environment. The only exception being a very precise and complete explanation as to why a reinstall will fix the problem. But some debugging first would be nice. I have spent hours attempting to insure that no white space or improper code exists in my modified modules. * Since this is occurring in a core module (class.wp-scripts.php:180), I was hoping this would be of interest to an author. * As an update, I have backup and restored a base copy of class.wp-scripts.php. Same error occured. * Thanx * Joe * [Denzel Chia](https://wordpress.org/support/users/denzel_chia/) * (@denzel_chia) * [10 years, 10 months ago](https://wordpress.org/support/topic/cannot-send-session-cookiecacheheader-in-session_start/#post-6327033) * Hi, * If you think that is a bug in WordPress, you can report it [https://make.wordpress.org/core/handbook/testing/reporting-bugs/](https://make.wordpress.org/core/handbook/testing/reporting-bugs/) * Thanks * Thread Starter [WPAdminJoe](https://wordpress.org/support/users/wpadminjoe/) * (@wpadminjoe) * [10 years, 10 months ago](https://wordpress.org/support/topic/cannot-send-session-cookiecacheheader-in-session_start/#post-6327039) * Hey Danzel, * Your suggestion is a good one and thank you for the link. Before doing so however, I am going to open a new post in the WordPress Forum where this should have probably been in the first place since it is a core issue. * Thanx again. Cheers. * Thread Starter [WPAdminJoe](https://wordpress.org/support/users/wpadminjoe/) * (@wpadminjoe) * [10 years, 10 months ago](https://wordpress.org/support/topic/cannot-send-session-cookiecacheheader-in-session_start/#post-6327040) * Closed but unresolved. Moved to the WordPress Forum where it belongs. Viewing 6 replies - 1 through 6 (of 6 total) The topic ‘Cannot send session cookie/cache/header in session_start().’ is closed to new replies. * ![](https://i0.wp.com/themes.svn.wordpress.org/evolve/4.3.7/screenshot.png) * evolve * [Support Threads](https://wordpress.org/support/theme/evolve/) * [Active Topics](https://wordpress.org/support/theme/evolve/active/) * [Unresolved Topics](https://wordpress.org/support/theme/evolve/unresolved/) * [Reviews](https://wordpress.org/support/theme/evolve/reviews/) ## Tags * [cache](https://wordpress.org/support/topic-tag/cache/) * [cookie](https://wordpress.org/support/topic-tag/cookie/) * [header](https://wordpress.org/support/topic-tag/header/) * [session_start](https://wordpress.org/support/topic-tag/session_start/) * 6 replies * 2 participants * Last reply from: [WPAdminJoe](https://wordpress.org/support/users/wpadminjoe/) * Last activity: [10 years, 10 months ago](https://wordpress.org/support/topic/cannot-send-session-cookiecacheheader-in-session_start/#post-6327040) * Status: resolved