Fatal error: Uncaught Error: Call to undefined function add_action() in /home/zadanie333/public_html/zadaniexynl/wypozyczalnia/wp-includes/blocks/navigation.php:677 Stack trace: #0 {main} thrown in /home/zadanie333/public_html/zadaniexynl/wypozyczalnia/wp-includes/blocks/navigation.php on line 677