Fatal error: Uncaught Error: Call to undefined function add_action() in /var/sites/b/belfastmediafestival.co.uk/public_html/wp-includes/blocks/categories.php:102 Stack trace: #0 {main} thrown in /var/sites/b/belfastmediafestival.co.uk/public_html/wp-includes/blocks/categories.php on line 102