Hi Adriano,
I tried to set the Calendar Enhancements notification setting in the Members section to send email about RSVPed events on the day they take place by default, and got the error message below. My site is completely updated to 4.5.1 and I'm using the latest version of Calendar Enhancements.
>>>Vinny
A configuration or server error has occurred
Error: Call to undefined method IPS\rsvpevents\extensions\core\Notifications\rsvpevents::configurationOptions() (0)
#0 /var/www/html/105106/system/Dispatcher/Controller.php(90): IPS\core\modules\admin\membersettings\_notifications->edit()
#1 /var/www/html/105106/applications/core/modules/admin/membersettings/notifications.php(38): IPS\Dispatcher\_Controller->execute()
#2 /var/www/html/105106/system/Dispatcher/Dispatcher.php(152): IPS\core\modules\admin\membersettings\_notifications->execute()
#3 /var/www/html/105106/admin/index.php(14): IPS\_Dispatcher->run()
#4 {main}
