Title: Error: Headers already sent
Last modified: August 19, 2016

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# Error: Headers already sent

 *  [curvy-jones](https://wordpress.org/support/users/curvy-jones/)
 * (@curvy-jones)
 * [15 years, 10 months ago](https://wordpress.org/support/topic/error-headers-already-sent/)
 * Hello, I am trying to resolve an issue I am having with my installation. Earlier
   today I was able to get into my wordpress backend just fine. This afternoon, 
   no such luck. I am getting the following error when I try to login:
 * ‘Warning: Cannot modify header information – headers already sent by (output 
   started at /home/nsync908/public_html/stillnsync/dataquery.php:1) in /home/nsync908/
   public_html/stillnsync/wp-includes/pluggable.php on line 890’
 * I’ve done some research and have checked out wp-config.php and pluggable.php 
   and I don’t see any extra spaces or anything. I don’t know much more about how
   to decipher this problem to figure out the issue. I’m not up on php at all and
   I don’t know where to find line 890.
 * Any help would be greatly appreciated.

Viewing 5 replies - 1 through 5 (of 5 total)

 *  [esmi](https://wordpress.org/support/users/esmi/)
 * (@esmi)
 * [15 years, 10 months ago](https://wordpress.org/support/topic/error-headers-already-sent/#post-1573158)
 * [Solving “headers already sent” warnings](http://codex.wordpress.org/FAQ_Troubleshooting#How_do_I_solve_the_Headers_already_sent_warning_problem.3F)
 *  Thread Starter [curvy-jones](https://wordpress.org/support/users/curvy-jones/)
 * (@curvy-jones)
 * [15 years, 10 months ago](https://wordpress.org/support/topic/error-headers-already-sent/#post-1573163)
 * I have been staring at that page and troubleshooting various for the better part
   of an hour before posting here. I mentioned above that I checked both wp-config
   and the pluggable files and I see no blank spaces.
 *  [esmi](https://wordpress.org/support/users/esmi/)
 * (@esmi)
 * [15 years, 10 months ago](https://wordpress.org/support/topic/error-headers-already-sent/#post-1573167)
 * The issues could be in any one or more of your theme’s template files – especially
   functions.php – or in any one of your plugins. Try:
    – switching to the default
   theme by renaming your current theme’s folder using [FTP](http://codex.wordpress.org/FTP_Clients)
   or whatever file management application your host provides)
 * – [resetting the plugins folder](http://codex.wordpress.org/FAQ_Troubleshooting#How_to_deactivate_all_plugins_when_not_able_to_access_the_administrative_menus.3F)
   by FTP or phpMyAdmin.
 *  Thread Starter [curvy-jones](https://wordpress.org/support/users/curvy-jones/)
 * (@curvy-jones)
 * [15 years, 10 months ago](https://wordpress.org/support/topic/error-headers-already-sent/#post-1573175)
 * I hate to mess with phpmyadmin. I don’t have a clue what I am doing and my back
   end person is out with a family emergency.
 * If I overwrite functions.php with a clean file from a fresh install, does that
   pose a problem? I have two plugins that I added 2 days ago. The site was working
   this morning so I don’t think it’s either of those.
 *  [iridiax](https://wordpress.org/support/users/iridiax/)
 * (@iridiax)
 * [15 years, 10 months ago](https://wordpress.org/support/topic/error-headers-already-sent/#post-1573191)
 * > Warning: Cannot modify header information – headers already sent by (output
   > started at /home/nsync908/public_html/stillnsync/dataquery.php:1)
 * What is dataquery.php and where did it come from?

Viewing 5 replies - 1 through 5 (of 5 total)

The topic ‘Error: Headers already sent’ is closed to new replies.

 * In: [Fixing WordPress](https://wordpress.org/support/forum/how-to-and-troubleshooting/)
 * 5 replies
 * 3 participants
 * Last reply from: [iridiax](https://wordpress.org/support/users/iridiax/)
 * Last activity: [15 years, 10 months ago](https://wordpress.org/support/topic/error-headers-already-sent/#post-1573191)
 * Status: not resolved

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