Fatal error: Uncaught Error: Class 'IXR_Client' not found in /home/waoupcomsy/refonte2020/wp-includes/IXR/class-IXR-clientmulticall.php:8
Stack trace:
#0 {main}
thrown in /home/waoupcomsy/refonte2020/wp-includes/IXR/class-IXR-clientmulticall.php on line 8