Title: warning using plugin
Last modified: September 30, 2020

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# warning using plugin

 *  Resolved [Willem 2](https://wordpress.org/support/users/willem-2/)
 * (@willem-2)
 * [5 years, 8 months ago](https://wordpress.org/support/topic/warning-using-plugin/)
 * I get a warning when I open customizer in a twenty twelve theme. The warning 
   is shown a very short time before the customizer page opens. When I open the 
   source of the customizer page I see the next warning:
 * <b>Warning</b>: Cannot modify header information – headers already sent by (output
   started at /home/…/public_html/wp-content/plugins/wp-to-buffer/vendor/includes/
   admin/admin.php:215) in <b>/home/…/public_html/wp-admin/customize.php</b> on 
   line <b>126</b><br />
 * I replaced the information which can lead to my website with …
 * Can you help me to get rid of this warning?
 * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Fwarning-using-plugin%2F%3Foutput_format%3Dmd&locale=en_US)
   to see the link]_

Viewing 1 replies (of 1 total)

 *  Plugin Author [wpzinc](https://wordpress.org/support/users/wpzinc/)
 * (@wpzinc)
 * [5 years, 8 months ago](https://wordpress.org/support/topic/warning-using-plugin/#post-13478157)
 * We’re not reproducing this in the following environment:
    – WordPress 5.5.1 –
   WP to Buffer 3.6.3 – Twenty Twelve 3.2
 * As access to the site would be required to see the issue first hand, please open
   a support request at [https://www.wpzinc.com/support](https://www.wpzinc.com/support),
   linking to this thread.

Viewing 1 replies (of 1 total)

The topic ‘warning using plugin’ is closed to new replies.

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## Tags

 * [warning](https://wordpress.org/support/topic-tag/warning/)

 * 1 reply
 * 2 participants
 * Last reply from: [wpzinc](https://wordpress.org/support/users/wpzinc/)
 * Last activity: [5 years, 8 months ago](https://wordpress.org/support/topic/warning-using-plugin/#post-13478157)
 * Status: resolved