Title: Cannot modify header when calling wp-admin
Last modified: August 30, 2016

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# Cannot modify header when calling wp-admin

 *  Resolved [Dave](https://wordpress.org/support/users/dnuttall/)
 * (@dnuttall)
 * [10 years, 9 months ago](https://wordpress.org/support/topic/cannot-modify-header-when-calling-wp-admin/)
 * Since updating to WP 4.3 when I try to login w/Youtube-embed-plus (free) 10.5
   activated, I get a list of some 16 “cannot modify header” errors that point to
   line 647 in Youtube-embed-plus and a line in pluggable.php, specifically lines:
   
   431,444,957-962,965=968, and 971-974.
 * The wp-admin accepts the userId/password, but login actually fails.
 * If I deactivate the Youtube-embed-plus pluggin, the errors go away, the login
   is allowed, but of course pages which contain links to YouTube videos don’t work.
 * Very old postings about the “cannot modify header” error suggests empty lines
   in wp-config, but that doesn’t appear to the be solution.
 * We do have WordFence (pro) running and I have tried deactivating all caching 
   but that doesn’t solve the problem.
 * The site is standard Dreamhost using FastCGI with PHP 5.6.
 * TIA for ideas on resolving this.
    Dave
 * [https://wordpress.org/plugins/youtube-embed-plus/](https://wordpress.org/plugins/youtube-embed-plus/)

Viewing 4 replies - 1 through 4 (of 4 total)

 *  Plugin Author [embedplus](https://wordpress.org/support/users/embedplus/)
 * (@embedplus)
 * [10 years, 9 months ago](https://wordpress.org/support/topic/cannot-modify-header-when-calling-wp-admin/#post-6494700)
 * Dave,
 * We think we know why the issue is occurring. It’s likely related to WP 4.3. Look
   out for an update this week, hopefully before the middle.
 * -EmbedPlus Team
 *  Plugin Author [embedplus](https://wordpress.org/support/users/embedplus/)
 * (@embedplus)
 * [10 years, 9 months ago](https://wordpress.org/support/topic/cannot-modify-header-when-calling-wp-admin/#post-6494773)
 * Dave,
 * Please download the latest version (10.6) and let us know if it fixes your issue.
 * -EmbedPlus Team
 *  Thread Starter [Dave](https://wordpress.org/support/users/dnuttall/)
 * (@dnuttall)
 * [10 years, 9 months ago](https://wordpress.org/support/topic/cannot-modify-header-when-calling-wp-admin/#post-6494787)
 * Dear EmbedPlus Team,
    I’m delighted to report that my instance of WP+EmbedPlus
   is working as expected with the update to 10.6!
 * Thank you for the timely, courteous and professional response.
    It is truly refreshing
   and inspirational to experience this level of support and will likely steer me
   to becoming a “Pro” customer as our meager resources permit.
 * Dave
 *  Plugin Author [embedplus](https://wordpress.org/support/users/embedplus/)
 * (@embedplus)
 * [10 years, 8 months ago](https://wordpress.org/support/topic/cannot-modify-header-when-calling-wp-admin/#post-6494795)
 * Sure Dave.
 * Please take a couple of minutes to rate us here: [https://wordpress.org/support/view/plugin-reviews/youtube-embed-plus?filter=5](https://wordpress.org/support/view/plugin-reviews/youtube-embed-plus?filter=5)
 * -EmbedPlus Team

Viewing 4 replies - 1 through 4 (of 4 total)

The topic ‘Cannot modify header when calling wp-admin’ is closed to new replies.

 * ![](https://ps.w.org/youtube-embed-plus/assets/icon-256x256.png?rev=2165403)
 * [Embed Plus for YouTube Gallery, Livestream and Lazy Loading with Facades](https://wordpress.org/plugins/youtube-embed-plus/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/youtube-embed-plus/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/youtube-embed-plus/)
 * [Active Topics](https://wordpress.org/support/plugin/youtube-embed-plus/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/youtube-embed-plus/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/youtube-embed-plus/reviews/)

## Tags

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

 * 4 replies
 * 2 participants
 * Last reply from: [embedplus](https://wordpress.org/support/users/embedplus/)
 * Last activity: [10 years, 8 months ago](https://wordpress.org/support/topic/cannot-modify-header-when-calling-wp-admin/#post-6494795)
 * Status: resolved