Fatal error: Uncaught Error: Call to undefined function add_filter() in /var/www/clients/client8/web9/web/wp-includes/class-wp-embed.php:20 Stack trace: #0 /var/www/clients/client8/web9/web/wp-includes/class-wp-embed.php(277): WP_Embed->__construct() #1 {main} thrown in /var/www/clients/client8/web9/web/wp-includes/class-wp-embed.php on line 20