Title: when plugin is activated WP Optimize Admin Header Error
Last modified: August 31, 2016

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# when plugin is activated WP Optimize Admin Header Error

 *  Resolved [Mitch](https://wordpress.org/support/users/n2rga/)
 * (@n2rga)
 * [10 years ago](https://wordpress.org/support/topic/when-plugin-is-activated-wp-optimize-admin-header-error/)
 * When I press WP Optimize from the admin dashboard bar I get this error with a
   blank screen
 * > Fatal error: Call to undefined function et_is_ab_testing_active() in /home/
   > XXXXXXXX/public_html/wp-content/themes/Divi/includes/builder/framework.php 
   > on line 54
 * Elegant themes said to shut all plugins and when I activate the plugin that causes
   the error that’s the plugin that causing it. and this was the plugin
 * [https://wordpress.org/plugins/wps-hide-login/](https://wordpress.org/plugins/wps-hide-login/)

Viewing 2 replies - 1 through 2 (of 2 total)

 *  [Remy Perona](https://wordpress.org/support/users/tabrisrp/)
 * (@tabrisrp)
 * [10 years ago](https://wordpress.org/support/topic/when-plugin-is-activated-wp-optimize-admin-header-error/#post-7427823)
 * Hi,
 * please update to the latest version of the plugin, it should fix your issue
 *  Thread Starter [Mitch](https://wordpress.org/support/users/n2rga/)
 * (@n2rga)
 * [10 years ago](https://wordpress.org/support/topic/when-plugin-is-activated-wp-optimize-admin-header-error/#post-7427824)
 * I Just did now I get a **This has been disabled** Notice now

Viewing 2 replies - 1 through 2 (of 2 total)

The topic ‘when plugin is activated WP Optimize Admin Header Error’ is closed to
new replies.

 * ![](https://ps.w.org/wps-hide-login/assets/icon-256x256.png?rev=1820667)
 * [WPS Hide Login](https://wordpress.org/plugins/wps-hide-login/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/wps-hide-login/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/wps-hide-login/)
 * [Active Topics](https://wordpress.org/support/plugin/wps-hide-login/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/wps-hide-login/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/wps-hide-login/reviews/)

 * 2 replies
 * 2 participants
 * Last reply from: [Mitch](https://wordpress.org/support/users/n2rga/)
 * Last activity: [10 years ago](https://wordpress.org/support/topic/when-plugin-is-activated-wp-optimize-admin-header-error/#post-7427824)
 * Status: resolved