Title: "Cannot modify header information" Error
Last modified: August 24, 2016

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# "Cannot modify header information" Error

 *  Resolved [ywickham](https://wordpress.org/support/users/ywickham/)
 * (@ywickham)
 * [11 years ago](https://wordpress.org/support/topic/cannot-modify-header-information-error-10/)
 * I was running into this problem when trying to view or download files:
 * > Warning: Cannot modify header information – headers already sent by (output
   > started at /home/public_html/wp-head.php:37) in /home/public_html/wp-content/
   > plugins/wp-publication-archive/lib/class.wp-publication-archive.php on line
   > 199
 * For those having the same issue, I was able to fix it by adding the following
   code to my functions.php file:
 *     ```
       //allow redirection, even if my theme starts to send output to the browser
       add_action('init', 'do_output_buffer');
       function do_output_buffer() {
               ob_start();
       }
       ```
   
 * For the full explanation of why this works, view this StackOverflow article here:
 * [http://stackoverflow.com/questions/7381661/cannot-modify-header-information-headers-already-sent-by-wordpress-issue](http://stackoverflow.com/questions/7381661/cannot-modify-header-information-headers-already-sent-by-wordpress-issue)
 * Hope this saves someone else some trouble!
 * [https://wordpress.org/plugins/wp-publication-archive/](https://wordpress.org/plugins/wp-publication-archive/)

The topic ‘"Cannot modify header information" Error’ is closed to new replies.

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 * 0 replies
 * 1 participant
 * Last reply from: [ywickham](https://wordpress.org/support/users/ywickham/)
 * Last activity: [11 years ago](https://wordpress.org/support/topic/cannot-modify-header-information-error-10/)
 * Status: resolved