Fatal error: Uncaught Error: Call to undefined function add_action() in /home/oho09/public_html/lekcjatestdm/wp-content/themes/sydney/inc/customizer/customizer.php:517 Stack trace: #0 {main} thrown in /home/oho09/public_html/lekcjatestdm/wp-content/themes/sydney/inc/customizer/customizer.php on line 517