Fatal error: Uncaught Error: Class "WP_Block_Supports" not found in /home/pacs/vcg00/users/compgen.de/wordpress/wp-includes/block-supports/custom-classname.php:59 Stack trace: #0 {main} thrown in /home/pacs/vcg00/users/compgen.de/wordpress/wp-includes/block-supports/custom-classname.php on line 59