Fatal error: Uncaught Error: Class "IXR_Server" not found in /home/marketpl/public_html/marketpl_dev/functions_back2812.php/IXR/class-IXR-introspectionserver.php:9 Stack trace: #0 {main} thrown in /home/marketpl/public_html/marketpl_dev/functions_back2812.php/IXR/class-IXR-introspectionserver.php on line 9