Fatal error: Uncaught Error: Class 'IXR_Server' not found in /home/dawidgrabacz5/public_html/zadaniekb/wyporzyczalnia/wp-includes/IXR/class-IXR-introspectionserver.php:9 Stack trace: #0 {main} thrown in /home/dawidgrabacz5/public_html/zadaniekb/wyporzyczalnia/wp-includes/IXR/class-IXR-introspectionserver.php on line 9