Fatal error: Uncaught Error: Call to undefined function add_action() in /home/oro/public_html/lekcjatestmp/IVIPzadanie/wp-includes/blocks/shortcode.php:31 Stack trace: #0 {main} thrown in /home/oro/public_html/lekcjatestmp/IVIPzadanie/wp-includes/blocks/shortcode.php on line 31