Title: Fatal Error when activating
Last modified: January 19, 2022

---

# Fatal Error when activating

 *  Resolved [MaldersIO](https://wordpress.org/support/users/freshymichael/)
 * (@freshymichael)
 * [4 years, 4 months ago](https://wordpress.org/support/topic/fatal-error-when-activating-72/)
 * There is a fatal error during activation:
 * `Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback)
   must be a valid callback, non-static method WP_Plugin_SumoMe::activate_SumoMe_plugin()
   cannot be called statically in /wordpress/core/5.8.3/wp-includes/class-wp-hook.
   php:303 Stack trace: #0 /wordpress/core/5.8.3/wp-includes/class-wp-hook.php(327):
   WP_Hook->apply_filters('', Array) #1 /wordpress/core/5.8.3/wp-includes/plugin.
   php(470): WP_Hook->do_action(Array) #2 /wordpress/core/5.8.3/wp-admin/plugins.
   php(193): do_action('activate_sumome...') #3 {main} thrown in /wordpress/core/
   5.8.3/wp-includes/class-wp-hook.php on line 303`
 * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Ffatal-error-when-activating-72%2F%3Foutput_format%3Dmd&locale=en_US)
   to see the link]_

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

 * ![](https://ps.w.org/sumome/assets/icon-256x256.png?rev=3147974)
 * [Website Pop-up Builder by BDOW! (formerly Sumo): Pop-ups + forms for email opt-ins and lead generation](https://wordpress.org/plugins/sumome/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/sumome/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/sumome/)
 * [Active Topics](https://wordpress.org/support/plugin/sumome/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/sumome/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/sumome/reviews/)

## Tags

 * [fatal error](https://wordpress.org/support/topic-tag/fatal-error/)

 * 0 replies
 * 1 participant
 * Last reply from: [MaldersIO](https://wordpress.org/support/users/freshymichael/)
 * Last activity: [4 years, 4 months ago](https://wordpress.org/support/topic/fatal-error-when-activating-72/)
 * Status: resolved