Getting error message

I get this error message on the site.

The all-in-one calendar has been disabled due to an error:

Generated class map is invalid: false. Please delete lib/bootstrap/loader-map.php (if it exists), make sure lib/bootstrap/ is writable by the web server, and enable debug mode by setting AI1EC_DEBUG to true (then back to false when done).

Error Details:

#0 /www/webvol24/71/z12nc1zhxi942zh/ehlers-danlos.se/public_html/wp-content/plugins/all-in-one-event-calendar/all-in-one-event-calendar.php(89): Ai1ec_Loader->__construct(‘/www/webvol24/7…’)
#1 /www/webvol24/71/z12nc1zhxi942zh/ehlers-danlos.se/public_html/wp-settings.php(447): include_once(‘/www/webvol24/7…’)
#2 /www/webvol24/71/z12nc1zhxi942zh/ehlers-danlos.se/public_html/wp-config.php(163): require_once(‘/www/webvol24/7…’)
#3 /www/webvol24/71/z12nc1zhxi942zh/ehlers-danlos.se/public_html/wp-load.php(50): require_once(‘/www/webvol24/7…’)
#4 /www/webvol24/71/z12nc1zhxi942zh/ehlers-danlos.se/public_html/wp-admin/admin.php(34): require_once(‘/www/webvol24/7…’)
#5 /www/webvol24/71/z12nc1zhxi942zh/ehlers-danlos.se/public_html/wp-admin/index.php(10): require_once(‘/www/webvol24/7…’)
#6 {main}

Request Uri: /wp-admin/?ai1ec_reactivate_plugin=true

I have deleted the file “loader-map.php” but I can′t find where to change the “and enable debug mode by setting AI1EC_DEBUG to true”

I have WP 6.1.1 and PHP 8.1 and version 3.0.0 of Timely All-in-One Events Calender, the site was working fine until January 2nd when i got Internal server error 500 and fixed that problem but then this problem occurred.

I would be grateful for help to solve the problem and please update so that the extension can handle php 8.1 and WP 6.1.1

The page I need help with: [log in to see the link]