Fatal error: Uncaught Error: Class 'Tribe\Shortcode\Shortcode_Abstract' not found in /home/malvernj/public_html/wp-content/plugins/event-tickets/src/Tribe/Shortcodes/Tribe_Tickets_Checkout.php:23 Stack trace: #0 {main} thrown in /home/malvernj/public_html/wp-content/plugins/event-tickets/src/Tribe/Shortcodes/Tribe_Tickets_Checkout.php on line 23