Fatal error: Uncaught Error: Call to undefined function add_action() in /opt/bitnami/wordpress-rendytrendy/htdocs/wp-content/themes/twentyfifteen/inc/custom-header.php:47 Stack trace: #0 {main} thrown in /opt/bitnami/wordpress-rendytrendy/htdocs/wp-content/themes/twentyfifteen/inc/custom-header.php on line 47