Fatal error: Uncaught Error: Call to undefined function add_action() in /home/zadanie333/public_html/zadaniexynl/wypozyczalnia/wp-includes/blocks/post-template.php:128 Stack trace: #0 {main} thrown in /home/zadanie333/public_html/zadaniexynl/wypozyczalnia/wp-includes/blocks/post-template.php on line 128