Fatal error: Uncaught Error: Call to undefined function add_filter() in /var/www/vhosts/awxpokmt.host213.checkdomain.de/htdocs/playground/wordpress/wp-includes/block-supports/elements.php:126 Stack trace: #0 {main} thrown in /var/www/vhosts/awxpokmt.host213.checkdomain.de/htdocs/playground/wordpress/wp-includes/block-supports/elements.php on line 126