Title: header already sent
Last modified: August 20, 2016

---

# header already sent

 *  [seyha](https://wordpress.org/support/users/seyha/)
 * (@seyha)
 * [14 years, 10 months ago](https://wordpress.org/support/topic/header-already-sent-2/)
 * Dear all,
 * I develop on plugin that use ajax, This is code my for ajax:
 * _[Code moderated as per the [Forum Rules](http://codex.wordpress.org/Forum_Welcome#Posting_Code).
   Please use the [pastebin](http://wordpress.pastebin.com/)]_
 * I work normally during I install this plugin but when I click on button login
   of this plugin it has some error as below:
 * Warning: Cannot modify header information – headers already sent by (output started
   at /var/www/wordpress/wp-content/plugins/sidebar-login/sidebar-login.php:16) 
   in /var/www/wordpress/wp-content/plugins/sidebar-login/sidebar-login.php on line
   364
 * How can I fix this problem? if anyone know how solve it please quide me. I am
   appreciated with your help.
 * Best Regards,

The topic ‘header already sent’ is closed to new replies.

 * 0 replies
 * 1 participant
 * Last reply from: [seyha](https://wordpress.org/support/users/seyha/)
 * Last activity: [14 years, 10 months ago](https://wordpress.org/support/topic/header-already-sent-2/)
 * Status: not resolved

## Topics

### Topics with no replies

### Non-support topics

### Resolved topics

### Unresolved topics

### All topics