Fatal error: Uncaught Error: Call to undefined function the_custom_header_markup() in /var/www/html/selimlab/wp-content/themes/twentyseventeen/template-parts/header/header-image.php:15 Stack trace: #0 {main} thrown in /var/www/html/selimlab/wp-content/themes/twentyseventeen/template-parts/header/header-image.php on line 15