Title: Warning: Cannot modify header information – Installation Error
Last modified: December 28, 2025

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# Warning: Cannot modify header information – Installation Error

 *  [filewalker](https://wordpress.org/support/users/filewalker/)
 * (@filewalker)
 * [5 months, 2 weeks ago](https://wordpress.org/support/topic/warning-cannot-modify-header-information-installation-error/)
 * Hi there,
   Just bought your plugin saddly the installation failed!Warning: Cannot
   modify header information – headers already sent by (output started at /home/
   httpd/vhosts/xxx.com/httpdocs/wp-content/plugins/button-pro/inc/cpt/button-cpt.
   php:167) in /home/httpd/vhosts/xxx.com/httpdocs/wp-includes/functions.php on 
   line 7182 Warning: Cannot modify header information – headers already sent by(
   output started at /home/httpd/vhosts/xxx.com/httpdocs/wp-content/plugins/button-
   pro/inc/cpt/button-cpt.php:167) in /home/httpd/vhosts/xxx.com/httpdocs/wp-admin/
   admin-header.php on line 14Worpress 6.9PHP 8.3Thanks.

Viewing 1 replies (of 1 total)

 *  [sunilweb](https://wordpress.org/support/users/sunilweb/)
 * (@sunilweb)
 * [4 months, 2 weeks ago](https://wordpress.org/support/topic/warning-cannot-modify-header-information-installation-error/#post-18795615)
 * Hello [@filewalker](https://wordpress.org/support/users/filewalker/),
 * Thanks for reaching out to us,
 * Our team has released a new update for the Pro version; you can update it now.
 * Thanks.

Viewing 1 replies (of 1 total)

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 * 1 reply
 * 2 participants
 * Last reply from: [sunilweb](https://wordpress.org/support/users/sunilweb/)
 * Last activity: [4 months, 2 weeks ago](https://wordpress.org/support/topic/warning-cannot-modify-header-information-installation-error/#post-18795615)
 * Status: not resolved