Fatal error: Uncaught Error: Class "IXR_Server" not found in /home/.sites/38/site25/web/wp-includesXX/IXR/class-IXR-introspectionserver.php:9 Stack trace: #0 {main} thrown in /home/.sites/38/site25/web/wp-includesXX/IXR/class-IXR-introspectionserver.php on line 9