Title: Error message: Warning: Cannot modify header information
Last modified: August 20, 2016

---

# Error message: Warning: Cannot modify header information

 *  [peterspliid](https://wordpress.org/support/users/peterspliid/)
 * (@peterspliid)
 * [14 years, 11 months ago](https://wordpress.org/support/topic/error-message-warning-cannot-modify-header-information/)
 * I just moved my site from one host to another, by manually moving the files and
   MySQL server from the first host to the second. Now when I enter the site from
   the new host, I get the following error message:
 * > Warning: Cannot modify header information – headers already sent by (output
   > started at /home/iosjail1/public_html/index.php:4) in /home/iosjail1/public_html/
   > wp-includes/pluggable.php on line 897
 * Here is line 893-899
 *     ```
       if ( !empty( $headers ) ) {
   
       		foreach( (array) $headers as $name => $content ) {
   
       			$phpmailer->AddCustomHeader( sprintf( '%1$s: %2$s', $name, $content ) );
   
       		}
       ```
   
 * I have already edited wp-config so the mysql server details are correct. Hope
   someone is willing to help. Thank you 🙂

Viewing 1 replies (of 1 total)

 *  Thread Starter [peterspliid](https://wordpress.org/support/users/peterspliid/)
 * (@peterspliid)
 * [14 years, 11 months ago](https://wordpress.org/support/topic/error-message-warning-cannot-modify-header-information/#post-2160552)
 * I would really appreciate some help

Viewing 1 replies (of 1 total)

The topic ‘Error message: Warning: Cannot modify header information’ is closed to
new replies.

 * In: [Fixing WordPress](https://wordpress.org/support/forum/how-to-and-troubleshooting/)
 * 1 reply
 * 1 participant
 * Last reply from: [peterspliid](https://wordpress.org/support/users/peterspliid/)
 * Last activity: [14 years, 11 months ago](https://wordpress.org/support/topic/error-message-warning-cannot-modify-header-information/#post-2160552)
 * Status: not resolved

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