Title: error
Last modified: December 19, 2022

---

# error

 *  [anuj9122](https://wordpress.org/support/users/anuj9122/)
 * (@anuj9122)
 * [3 years, 5 months ago](https://wordpress.org/support/topic/error-1727/)
 * error
 * Plugin could not be activated because it triggered a **fatal error**.
 * **Fatal error**: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback)
   must be a valid callback, class “Download_Delay_Redirect” not found in /home/
   grouptoall/public_html/wp-includes/class-wp-hook.php:308 Stack trace: #0 /home/
   grouptoall/public_html/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters()#
   1 /home/grouptoall/public_html/wp-includes/plugin.php(517): WP_Hook->do_action()#
   2 /home/grouptoall/public_html/wp-admin/plugins.php(194): do_action() #3 {main}
   thrown in **/home/grouptoall/public_html/wp-includes/class-wp-hook.php** on line**
   308**
    -  This topic was modified 3 years, 5 months ago by [anuj9122](https://wordpress.org/support/users/anuj9122/).
 * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Ferror-1727%2F%3Foutput_format%3Dmd&locale=en_US)
   to see the link]_

The topic ‘error’ is closed to new replies.

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 * 0 replies
 * 1 participant
 * Last reply from: [anuj9122](https://wordpress.org/support/users/anuj9122/)
 * Last activity: [3 years, 5 months ago](https://wordpress.org/support/topic/error-1727/)
 * Status: not resolved