Fatal error: Uncaught Error: Class 'IXR_Server' not found in /home/.sites/162/site1406375/web/LIVE/wp-includes/IXR/class-IXR-introspectionserver.php:9
Stack trace:
#0 {main}
  thrown in /home/.sites/162/site1406375/web/LIVE/wp-includes/IXR/class-IXR-introspectionserver.php on line 9