Title: Error message
Last modified: January 26, 2020

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# Error message

 *  [gkoper](https://wordpress.org/support/users/gkoper/)
 * (@gkoper)
 * [6 years, 4 months ago](https://wordpress.org/support/topic/error-message-801/)
 * Upon switching to the customizer an error message flashes by
 * PHP Warning: Cannot modify header information – headers already sent by (output
   started at /var/www/domains/gerkoper.nl/subdomains/blog/wp-content/plugins/simple-
   download-monitor/main.php:265) in /var/www/domains/gerkoper.nl/subdomains/blog/
   wp-admin/customize.php on line 126
 * Albeit just a warning, it is unsettling to non-experienced users.
 * Can something be done about that?
 * Thanks in advance,
 * Ger

Viewing 3 replies - 1 through 3 (of 3 total)

 *  Plugin Contributor [mbrsolution](https://wordpress.org/support/users/mbrsolution/)
 * (@mbrsolution)
 * [6 years, 4 months ago](https://wordpress.org/support/topic/error-message-801/#post-12367621)
 * Thank you reaching out to us and reporting this warning message. I have submitted
   a message to the developers to investigate your findings.
 * Kind regards
    -  This reply was modified 6 years, 4 months ago by [mbrsolution](https://wordpress.org/support/users/mbrsolution/).
 *  Plugin Author [mra13 / Team Tips and Tricks HQ](https://wordpress.org/support/users/mra13/)
 * (@mra13)
 * [6 years, 4 months ago](https://wordpress.org/support/topic/error-message-801/#post-12371149)
 * Thank you. I will work on removing it in the next release.
 *  Thread Starter [gkoper](https://wordpress.org/support/users/gkoper/)
 * (@gkoper)
 * [6 years, 4 months ago](https://wordpress.org/support/topic/error-message-801/#post-12375707)
 * Thanks in advance, Ger

Viewing 3 replies - 1 through 3 (of 3 total)

The topic ‘Error message’ is closed to new replies.

 * ![](https://ps.w.org/simple-download-monitor/assets/icon-128x128.png?rev=973803)
 * [Simple Download Monitor](https://wordpress.org/plugins/simple-download-monitor/)
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 * 3 replies
 * 3 participants
 * Last reply from: [gkoper](https://wordpress.org/support/users/gkoper/)
 * Last activity: [6 years, 4 months ago](https://wordpress.org/support/topic/error-message-801/#post-12375707)
 * Status: not resolved