Title: Plugin generates "Cannot modify header" errors, renders wp-admin inoperable
Last modified: August 20, 2016

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# Plugin generates "Cannot modify header" errors, renders wp-admin inoperable

 *  [dzagidulin](https://wordpress.org/support/users/dzagidulin/)
 * (@dzagidulin)
 * [15 years ago](https://wordpress.org/support/topic/plugin-generates-cannot-modify-header-errors-renders-wp-admin-inoperable/)
 * Dear SiteBrains team,
    I came across your plugin recently (via a Quora post, 
   actually), and decided to try it out. I installed SiteBrains plugin version 6.2.1(
   I’m running WordPress version 3.2.1). It installed and activated seemingly without
   trouble, however, when I go to perform pretty much any administrative action (
   save a settings, moderate a comment), I get a blank page and the same error as
   in this post: [http://wordpress.org/support/topic/i-cant-log-in-to-wp-admin](http://wordpress.org/support/topic/i-cant-log-in-to-wp-admin)
   Specifically, `"Warning: Cannot modify header information - headers already sent
   by (output started at /*my site*/public_html/wp-content/plugins/sitebrains-1/
   Index.php:1) in /*my site*/public_html/wp-includes/pluggable.php on line 934"`
 * Disabling your plugin fixed the errors, but I would certainly like to give it
   another try, if fixed.
 * Some more details:
    To see if any of my plugins are interfering with SiteBrains,
   I deactivated all my other plugins and re-Activated SiteBrains. Incidentally,
   during re-activation, I got the following warning from WordPress: `The plugin
   generated 3 characters of unexpected output during activation. If you notice “
   headers already sent” messages, problems with syndication feeds or other issues,
   try deactivating or removing this plugin.`
 * Anyways, the same error was generated even when SiteBrains was the only active
   error.
 * I’m happy to provide any other diagnostics info.

Viewing 1 replies (of 1 total)

 *  Plugin Author [sitebrains](https://wordpress.org/support/users/sitebrains/)
 * (@sitebrains)
 * [15 years ago](https://wordpress.org/support/topic/plugin-generates-cannot-modify-header-errors-renders-wp-admin-inoperable/#post-2275572)
 * Hello,
 * Thank you for reporting this bug. We did identify and resolve this bug recently
   and updated the SVN. Please re-download the source and install the plugin again
   and then test. If you would be kind enough to report back to confirm the fix,
   we would appreciate it. You can also email me; jon at sitebrains.com if you have
   any questions or need support.
 * Thank you,
    Jon

Viewing 1 replies (of 1 total)

 The topic ‘Plugin generates "Cannot modify header" errors, renders wp-admin inoperable’
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 * ![](https://s.w.org/plugins/geopattern-icon/sitebrains-1.svg)
 * [SiteBrains Interactive Spam Blocker](https://wordpress.org/plugins/sitebrains-1/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/sitebrains-1/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/sitebrains-1/)
 * [Active Topics](https://wordpress.org/support/plugin/sitebrains-1/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/sitebrains-1/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/sitebrains-1/reviews/)

 * 1 reply
 * 2 participants
 * Last reply from: [sitebrains](https://wordpress.org/support/users/sitebrains/)
 * Last activity: [15 years ago](https://wordpress.org/support/topic/plugin-generates-cannot-modify-header-errors-renders-wp-admin-inoperable/#post-2275572)
 * Status: not resolved