Fatal error: Uncaught Error: Call to undefined function apply_filters() in /home/malvernj/public_html/wp-content/plugins/event-tickets/src/views/blocks/tickets/submit-button.php:30 Stack trace: #0 {main} thrown in /home/malvernj/public_html/wp-content/plugins/event-tickets/src/views/blocks/tickets/submit-button.php on line 30