Fatal error: Uncaught Error: Class "IXR_Client" not found in /home/pacs/vcg00/users/compgen.de/wordpress/wp-includes/IXR/class-IXR-clientmulticall.php:8 Stack trace: #0 {main} thrown in /home/pacs/vcg00/users/compgen.de/wordpress/wp-includes/IXR/class-IXR-clientmulticall.php on line 8