Fatal error: Uncaught Error: Class 'IXR_Server' not found in /home/oho09/public_html/lekcjatestdm/wp-includes/class-wp-xmlrpc-server.php:24 Stack trace: #0 {main} thrown in /home/oho09/public_html/lekcjatestdm/wp-includes/class-wp-xmlrpc-server.php on line 24