Title: cannot remove user (Warning: Cannot modify header information)
Last modified: August 21, 2016

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# cannot remove user (Warning: Cannot modify header information)

 *  Resolved [webby1973](https://wordpress.org/support/users/webby1973/)
 * (@webby1973)
 * [12 years, 8 months ago](https://wordpress.org/support/topic/cannot-remove-user-warning-cannot-modify-header-information/)
 * I wanted to remove a user from the main site, but this is the alert:
    “Warning:
   Cannot modify header information – headers already sent by (output started at/
   home/xxx/domains/xxx/public_html/wp-content/plugins/multisite-toolbar-additions/
   multisite-toolbar-additions.php:878) in /home/xxx/domains/xxx/public_html/wp-
   includes/pluggable.php on line 875”
 * I reloaded the page, still the same error and nothing else (except the Notice
   I posted on a previous thread), but going back with the browser showed the user
   was actually deleted from the specified webiste.
    So, what is that warning about?
 * [http://wordpress.org/plugins/multisite-toolbar-additions/](http://wordpress.org/plugins/multisite-toolbar-additions/)

Viewing 5 replies - 1 through 5 (of 5 total)

 *  Plugin Author [David Decker](https://wordpress.org/support/users/daveshine/)
 * (@daveshine)
 * [12 years, 8 months ago](https://wordpress.org/support/topic/cannot-remove-user-warning-cannot-modify-header-information/#post-4096094)
 * [@webby1973](https://wordpress.org/support/users/webby1973/):
    Thanks for your
   feedback!
 * Just tested, cannot reproduce that.
 * However, I just made test file, with added checks for some constants.
    It would
   help me, if you could test the below linked file. Just overwrite the main plugin
   file in /wp-content/plugins/multisite-toolbar-additions/ with the unzipped file
   from my download. That should fix this. Download here: [https://www.dropbox.com/s/zbekvwhyxcaktmi/multisite-toolbar-additions_test.zip](https://www.dropbox.com/s/zbekvwhyxcaktmi/multisite-toolbar-additions_test.zip)
 * Does that help?
 * Thanks, Dave 🙂
 *  Thread Starter [webby1973](https://wordpress.org/support/users/webby1973/)
 * (@webby1973)
 * [12 years, 8 months ago](https://wordpress.org/support/topic/cannot-remove-user-warning-cannot-modify-header-information/#post-4096120)
 * Hello Dave,
 * what did you use to compress it? when I unzip it, it just creates a file “multisite-
   toolbar-additions_test.zip.cpgz”
 *  Plugin Author [David Decker](https://wordpress.org/support/users/daveshine/)
 * (@daveshine)
 * [12 years, 8 months ago](https://wordpress.org/support/topic/cannot-remove-user-warning-cannot-modify-header-information/#post-4096124)
 * It was zipped with the regular Ubuntu ZIP app – use that for all, never heard
   of such a behavior. Maybe it’s on your OS or from saving? — Just did another 
   download from Dropbox and works great…
 * However, please try this link:
    [https://www.dropbox.com/s/gn6ra816vvtrsxi/multisite-toolbar-additions.php](https://www.dropbox.com/s/gn6ra816vvtrsxi/multisite-toolbar-additions.php)–
   > it’s directly to the php file –> use the “Download” link on the top right corner
 * Thanks, Dave 🙂
 *  Thread Starter [webby1973](https://wordpress.org/support/users/webby1973/)
 * (@webby1973)
 * [12 years, 8 months ago](https://wordpress.org/support/topic/cannot-remove-user-warning-cannot-modify-header-information/#post-4096126)
 * Dave,
 * now it is working 🙂 Thank you.
    I did some tests, creating and deleting users,
   no problem. I’ll let you know if the notice appears again.
 * PS: my desktop is OS X.
 *  Plugin Author [David Decker](https://wordpress.org/support/users/daveshine/)
 * (@daveshine)
 * [12 years, 8 months ago](https://wordpress.org/support/topic/cannot-remove-user-warning-cannot-modify-header-information/#post-4096127)
 * Great, thank you!
 * I guess I will push a bugfix update before the next big update 🙂
 * Thanks, Dave 🙂

Viewing 5 replies - 1 through 5 (of 5 total)

The topic ‘cannot remove user (Warning: Cannot modify header information)’ is closed
to new replies.

 * ![](https://s.w.org/plugins/geopattern-icon/multisite-toolbar-additions_9a6fd0.
   svg)
 * [Multisite Toolbar Additions](https://wordpress.org/plugins/multisite-toolbar-additions/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/multisite-toolbar-additions/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/multisite-toolbar-additions/)
 * [Active Topics](https://wordpress.org/support/plugin/multisite-toolbar-additions/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/multisite-toolbar-additions/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/multisite-toolbar-additions/reviews/)

 * 5 replies
 * 2 participants
 * Last reply from: [David Decker](https://wordpress.org/support/users/daveshine/)
 * Last activity: [12 years, 8 months ago](https://wordpress.org/support/topic/cannot-remove-user-warning-cannot-modify-header-information/#post-4096127)
 * Status: resolved