Fatal error: Uncaught Error: Call to undefined function add_filter() in /var/www/web2017/wp-includes/class-wp-embed.php:33 Stack trace: #0 /var/www/web2017/wp-includes/class-wp-embed.php(387): WP_Embed->__construct() #1 {main} thrown in /var/www/web2017/wp-includes/class-wp-embed.php on line 33