Fatal error: Uncaught Error: Call to undefined function add_action() in /home/cezarypiatek1990/public_html/testwordpressa/wp-content/themes/twentynineteen/inc/customizer.php:104 Stack trace: #0 {main} thrown in /home/cezarypiatek1990/public_html/testwordpressa/wp-content/themes/twentynineteen/inc/customizer.php on line 104