Fatal error: Uncaught Error: Call to undefined function add_action() in /home/FeRRKNG/public_html/szkolazs1mm/wordpress/wp-includes/blocks/calendar.php:61 Stack trace: #0 {main} thrown in /home/FeRRKNG/public_html/szkolazs1mm/wordpress/wp-includes/blocks/calendar.php on line 61