Title: Warning: Cannot modify header/…/wp-includes/session.php:1/…/wp-includes/plug
Last modified: August 30, 2016

---

# Warning: Cannot modify header/…/wp-includes/session.php:1/…/wp-includes/plug

 *  [shaeallison](https://wordpress.org/support/users/shaeallison/)
 * (@shaeallison)
 * [10 years, 6 months ago](https://wordpress.org/support/topic/warning-cannot-modify-headerwp-includessessionphp1wp-includesplug/)
 * Warning: Cannot modify header information – headers already sent by (output started
   at /home/shaeallison/webapps/website/wp-includes/session.php:1) in /home/shaeallison/
   webapps/website/wp-includes/pluggable.php on line 1207
 * I am currently seeing this error when I try to log into the admin side as well
   as when viewing some of my content. I also seem to be missing a lot of custom
   css changes that were done through Jetpack.
 * This is my portfolio site and I am currently applying for jobs. Does anyone know
   how this happened and how I can go about fixing it immediately?

The topic ‘Warning: Cannot modify header/…/wp-includes/session.php:1/…/wp-includes/
plug’ is closed to new replies.

## Tags

 * [cannot modify header](https://wordpress.org/support/topic-tag/cannot-modify-header/)
 * [pluggable.php](https://wordpress.org/support/topic-tag/pluggable-php/)
 * [warning](https://wordpress.org/support/topic-tag/warning/)
 * [wp-admin](https://wordpress.org/support/topic-tag/wp-admin/)
 * [wp-includes](https://wordpress.org/support/topic-tag/wp-includes/)

 * 0 replies
 * 1 participant
 * Last reply from: [shaeallison](https://wordpress.org/support/users/shaeallison/)
 * Last activity: [10 years, 6 months ago](https://wordpress.org/support/topic/warning-cannot-modify-headerwp-includessessionphp1wp-includesplug/)
 * Status: not resolved

## Topics

### Topics with no replies

### Non-support topics

### Resolved topics

### Unresolved topics

### All topics