Fatal error: Uncaught Error: Class "IXR_Server" not found in /usr/home/bmserwer1/domains/paniburger.pl/public_html/wp-includes/class-wp-xmlrpc-server.php:24 Stack trace: #0 {main} thrown in /usr/home/bmserwer1/domains/paniburger.pl/public_html/wp-includes/class-wp-xmlrpc-server.php on line 24