Title: admin-header.php Error
Last modified: August 19, 2016

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# admin-header.php Error

 *  [Impact009](https://wordpress.org/support/users/impact009/)
 * (@impact009)
 * [15 years, 3 months ago](https://wordpress.org/support/topic/admin-headerphp-error/)
 * Auto upgrade today failed. I deleted the .maintenance file and the upgrade folder.
   I received the following error when trying to access wp-admin or wp-login:
 * Fatal error: Call to undefined function is_network_admin() in /home/primal99/
   public_html/wp-admin/admin-header.php on line 16
 * I followed the steps for a manual upgrade and received the same error. Any solutions?
   A rollback feature would be nice for incidents like this.

Viewing 1 replies (of 1 total)

 *  [esmi](https://wordpress.org/support/users/esmi/)
 * (@esmi)
 * [15 years, 3 months ago](https://wordpress.org/support/topic/admin-headerphp-error/#post-1937123)
 * Your upgrade did not complete successfully.
 * Try:
    – switching to the Twenty Ten theme by renaming your current theme’s folder
   in wp-content/themes using [FTP](http://codex.wordpress.org/FTP_Clients) or whatever
   file management application your host provides. You may need to try logging into
   your site to get this to kick in fully.
 * – [resetting the plugins folder](http://codex.wordpress.org/FAQ_Troubleshooting#How_to_deactivate_all_plugins_when_not_able_to_access_the_administrative_menus.3F)
   by FTP or phpMyAdmin.
 * – re-running the upgrade manually.

Viewing 1 replies (of 1 total)

The topic ‘admin-header.php Error’ is closed to new replies.

## Tags

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

 * In: [Fixing WordPress](https://wordpress.org/support/forum/how-to-and-troubleshooting/)
 * 1 reply
 * 2 participants
 * Last reply from: [esmi](https://wordpress.org/support/users/esmi/)
 * Last activity: [15 years, 3 months ago](https://wordpress.org/support/topic/admin-headerphp-error/#post-1937123)
 * Status: not resolved

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