Fatal error: Uncaught Error: Call to undefined function add_action() in /home/cezarypiatek1990/public_html/testwordpressa/wp-includes/blocks/template-part.php:289 Stack trace: #0 {main} thrown in /home/cezarypiatek1990/public_html/testwordpressa/wp-includes/blocks/template-part.php on line 289