Title: The "Cannot modify header information" error when attempting wp-admin
Last modified: August 30, 2016

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# The "Cannot modify header information" error when attempting wp-admin

 *  [Opportunities](https://wordpress.org/support/users/opportunities/)
 * (@opportunities)
 * [10 years, 11 months ago](https://wordpress.org/support/topic/the-cannot-modify-header-information-error-when-attempting-wp-admin/)
 * Yep, it’s the “Cannot modify header information” error preventing me from seeing
   my admin panel. The actual site/blog renders fine.
    The error reads: “Warning:
   Cannot modify header information – headers already sent by (output started at/
   home1/gassaver/public_html/belly-fat-loser.com/wp-includes/general-template.php:
   2926) in /home1/gassaver/public_html/belly-fat-loser.com/wp-includes/pluggable.
   php on line 1196”
 * Line 2926 of general-template.php is in here:
    Line_2923 * [@param](https://wordpress.org/support/users/param/)
   string $file Style handle name or filename (without “.css” extension) * relative
   to wp-admin/. Defaults to ‘wp-admin’. */ Line_2926 echo apply_filters( ‘wp_admin_css’,“
   <link rel=’stylesheet’ href='” . esc_url( wp_admin_css_uri( $file ) ) . “‘ type
   =’text/css’ />\n”, $file );
 *  if ( function_exists( ‘is_rtl’ ) && is_rtl() ) {
    /** This filter is documented
   in wp-includes/general-template.php */ echo apply_filters( ‘wp_admin_css’, “<
   link rel=’stylesheet’ href='” . esc_url( wp_admin_css_uri( “$file-rtl” ) ) . “‘
   type=’text/css’ />\n”, “$file-rtl” ); } }
 * /**
 * Any help would be highly appreciated, thanks!

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

 *  [Peter Lawrenson](https://wordpress.org/support/users/lorro/)
 * (@lorro)
 * [10 years, 11 months ago](https://wordpress.org/support/topic/the-cannot-modify-header-information-error-when-attempting-wp-admin/#post-6264081)
 * I should progressively deactivate all plugins and switch to the default theme
   to try to identify the component that is causing the problem. WordPress, or the
   offending component, may need to be reinstalled.
 *  Thread Starter [Opportunities](https://wordpress.org/support/users/opportunities/)
 * (@opportunities)
 * [10 years, 11 months ago](https://wordpress.org/support/topic/the-cannot-modify-header-information-error-when-attempting-wp-admin/#post-6264138)
 * I downloaded a new copy of wordpress (4.2.2), changed the filename of the existing
   file that’s the listed offender (wp-includes/general-template.php), ftp’d the
   fresh copy to the directory. The same error remains. I cleared my browser cache,
   in case that would make a difference.
 * I’d expect a fresh copy of the file directly from WordPress would eliminate that
   file as the error culprit, but perhaps not. Any ideas?
 * Many thanks in advance.
 *  Moderator [t-p](https://wordpress.org/support/users/t-p/)
 * (@t-p)
 * [10 years, 11 months ago](https://wordpress.org/support/topic/the-cannot-modify-header-information-error-when-attempting-wp-admin/#post-6264140)
 * – Try reviewing this codex to solve header already sent problem: [http://codex.wordpress.org/FAQ_Troubleshooting#How_do_I_solve_the_Headers_already_sent_warning_problem.3F](http://codex.wordpress.org/FAQ_Troubleshooting#How_do_I_solve_the_Headers_already_sent_warning_problem.3F)
 *  Thread Starter [Opportunities](https://wordpress.org/support/users/opportunities/)
 * (@opportunities)
 * [10 years, 11 months ago](https://wordpress.org/support/topic/the-cannot-modify-header-information-error-when-attempting-wp-admin/#post-6264152)
 * Tara,
 * Yeah, thanks, I can just about recite that from memory now! I’ve heard of this
   error persisting even after a fresh WP install. How does that reconcile with 
   excess white space? Shouldn’t a fresh install have no excess spaces?
 * In any case, I was not thinking that installing a fresh copy of the indicated
   file would eliminate the error, but that it would manifest itself in a different
   file or later in the same one. I’ve heard of instances where it takes several
   rounds of fixing a file, that then leads to another that must be repaired. In
   my case though, the error line listed was the same.
 * Thanks,
 * Steve
 *  Thread Starter [Opportunities](https://wordpress.org/support/users/opportunities/)
 * (@opportunities)
 * [10 years, 11 months ago](https://wordpress.org/support/topic/the-cannot-modify-header-information-error-when-attempting-wp-admin/#post-6264162)
 * lorro, despite my skepticism, you nailed it. I logged into my control panel, 
   renamed the pluggins folder, and “Poof!” the error disappeared. I then re-activated
   them one at a time until it came back. The culprit? PopUp Domination.The fact
   that PopDom was V2, rathre than the current v3.5 probably had something to do
   with that. Thanks everyone for your help!

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

The topic ‘The "Cannot modify header information" error when attempting wp-admin’
is closed to new replies.

 * In: [Fixing WordPress](https://wordpress.org/support/forum/how-to-and-troubleshooting/)
 * 5 replies
 * 3 participants
 * Last reply from: [Opportunities](https://wordpress.org/support/users/opportunities/)
 * Last activity: [10 years, 11 months ago](https://wordpress.org/support/topic/the-cannot-modify-header-information-error-when-attempting-wp-admin/#post-6264162)
 * Status: not resolved

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