Fatal error: Uncaught Error: Class "Office365\Runtime\ClientObject" not found in C:\xampp\htdocs\vendor\vgrem\php-spo\src\SharePoint\RelatedItemManager.php:15 Stack trace: #0 {main} thrown in C:\xampp\htdocs\vendor\vgrem\php-spo\src\SharePoint\RelatedItemManager.php on line 15