Title: Fatal error when activating plugin
Last modified: October 24, 2018

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# Fatal error when activating plugin

 *  Resolved [lyden](https://wordpress.org/support/users/lydenyardley/)
 * (@lydenyardley)
 * [7 years, 7 months ago](https://wordpress.org/support/topic/fatal-error-when-activating-plugin-51/)
 * When I try to activate the plugin, it fails and gives a “Fatal error” message:
 * Fatal error: Uncaught Error: Class ‘WDN_Plugin’ not found in /home/wp_kpfhav/
   thesimplifiers.com/wp-content/plugins/clearfy/components/disable-admin-notices/
   updates/010007.php:13 Stack trace: #0 /home/wp_kpfhav/thesimplifiers.com/wp-content/
   plugins/clearfy/updates/010402.php(19): WDNUpdate010007->install() #1 /home/wp_kpfhav/
   thesimplifiers.com/wp-content/plugins/clearfy/libs/factory/core/includes/plugin.
   class.php(685): WCLUpdate010402->install() #2 /home/wp_kpfhav/thesimplifiers.
   com/wp-content/plugins/clearfy/libs/factory/core/includes/plugin.class.php(551):
   Wbcr_Factory408_Plugin->updateHook(‘1.2.1’, ‘1.4.2’) #3 /home/wp_kpfhav/thesimplifiers.
   com/wp-content/plugins/clearfy/libs/factory/core/includes/plugin.class.php(510):
   Wbcr_Factory408_Plugin->activationOrUpdateHook(true) #4 /home/wp_kpfhav/thesimplifiers.
   com/wp-includes/class-wp-hook.php(286): Wbcr_Factory408_Plugin->forceActivationHook(”)#
   5 /home/wp_kpfhav/thesimplifiers.com/wp-includes/class-wp-hook.php(310): WP_Hook-
   >apply_filters(”, Array) #6 /home/wp_kpfhav/the in /home/wp_kpfhav/thesimplifiers.
   com/wp-content/plugins/clearfy/components/disable-admin-notices/updates/010007.
   php on line 13

Viewing 3 replies - 1 through 3 (of 3 total)

 *  [webcraftic](https://wordpress.org/support/users/webcraftic/)
 * (@webcraftic)
 * [7 years, 7 months ago](https://wordpress.org/support/topic/fatal-error-when-activating-plugin-51/#post-10810854)
 * Hi,
 * Thank you for reporting the error.
 * Today I will release a new update with the solution.
 * Best regards, Alex
 *  [webcraftic](https://wordpress.org/support/users/webcraftic/)
 * (@webcraftic)
 * [7 years, 7 months ago](https://wordpress.org/support/topic/fatal-error-when-activating-plugin-51/#post-10811896)
 * Hi,
 * This bug has been fixed in the new version.
 * I am sorry that this happened to you. Next time I will test the plugin more thoroughly.
 * Best regards, Alex
 *  Thread Starter [lyden](https://wordpress.org/support/users/lydenyardley/)
 * (@lydenyardley)
 * [7 years, 7 months ago](https://wordpress.org/support/topic/fatal-error-when-activating-plugin-51/#post-10811991)
 * Nailed it! Great work!!!

Viewing 3 replies - 1 through 3 (of 3 total)

The topic ‘Fatal error when activating plugin’ is closed to new replies.

 * ![](https://ps.w.org/clearfy/assets/icon-256x256.gif?rev=2392119)
 * [Clearfy Cache – WordPress optimization plugin, Minify HTML, CSS & JS, Defer](https://wordpress.org/plugins/clearfy/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/clearfy/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/clearfy/)
 * [Active Topics](https://wordpress.org/support/plugin/clearfy/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/clearfy/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/clearfy/reviews/)

 * 3 replies
 * 2 participants
 * Last reply from: [lyden](https://wordpress.org/support/users/lydenyardley/)
 * Last activity: [7 years, 7 months ago](https://wordpress.org/support/topic/fatal-error-when-activating-plugin-51/#post-10811991)
 * Status: resolved