Fatal error: Uncaught Error: Call to undefined function add_action() in /home/MaksiuZi/public_html/bartektest/wp-content/themes/online-photography/inc/widgets/slider.php:11 Stack trace: #0 {main} thrown in /home/MaksiuZi/public_html/bartektest/wp-content/themes/online-photography/inc/widgets/slider.php on line 11