Fatal error: Uncaught Error: Class "RRule\RSet" not found in /usr/local/www/apache24/data/wp-content/plugins/events-calendar-pro/src/Events_Pro/Custom_Tables/V1/RRule/RSet_Wrapper.php:29 Stack trace: #0 {main} thrown in /usr/local/www/apache24/data/wp-content/plugins/events-calendar-pro/src/Events_Pro/Custom_Tables/V1/RRule/RSet_Wrapper.php on line 29