Title: Critical error when installed
Last modified: September 22, 2021

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# Critical error when installed

 *  [madhawa](https://wordpress.org/support/users/madhawa/)
 * (@madhawa)
 * [4 years, 8 months ago](https://wordpress.org/support/topic/critical-error-when-installed/)
 * I installed the plugin and activated it.
    Wordpress gives a critical error and
   the site’s most functions stopped working properly.
 * ================
    WordPress version 5.8.1 Current theme: Lectern (version 1.1.7)
   Current plugin: RSVPMaker for Toastmasters (version 4.9.1) PHP version 7.3.30
   ================ Error received
 * An error of type E_ERROR was caused in line 9550 of the file /home/madhawal/public_html/
   silverline/wp-content/plugins/rsvpmaker-for-toastmasters/rsvpmaker-for-toastmasters.
   php. Error message: Uncaught Error: Call to undefined function rsvpmail_is_problem()
   in /home/madhawal/public_html/silverline/wp-content/plugins/rsvpmaker-for-toastmasters/
   rsvpmaker-for-toastmasters.php:9550
    Stack trace: #0 /home/madhawal/public_html/
   silverline/wp-includes/class-wp-hook.php(303): rsvptoast_admin_notice(”) #1 /
   home/madhawal/public_html/silverline/wp-includes/class-wp-hook.php(327): WP_Hook-
   >apply_filters(NULL, Array) #2 /home/madhawal/public_html/silverline/wp-includes/
   plugin.php(470): WP_Hook->do_action(Array) #3 /home/madhawal/public_html/silverline/
   wp-admin/admin-header.php(287): do_action(‘admin_notices’) #4 /home/madhawal/
   public_html/silverline/wp-admin/plugins.php(603): require_once(‘/home/madhawal/…’)#
   5 {main} thrown`
 * Tried on 2 different hosts with 2 different php versions.
    The same error occurred.

The topic ‘Critical error when installed’ is closed to new replies.

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 * 0 replies
 * 1 participant
 * Last reply from: [madhawa](https://wordpress.org/support/users/madhawa/)
 * Last activity: [4 years, 8 months ago](https://wordpress.org/support/topic/critical-error-when-installed/)
 * Status: not resolved