Fatal error: Uncaught Error: Call to undefined function add_filter() in /home/djszklo/public_html/djszklo/wp-content/themes/mesmerize/inc/header-options/background-options/overlay-types/gradient-overlay.php:3 Stack trace: #0 {main} thrown in /home/djszklo/public_html/djszklo/wp-content/themes/mesmerize/inc/header-options/background-options/overlay-types/gradient-overlay.php on line 3