Fatal error: Uncaught Error: Class "Sabre\DAV\Mock\Collection" not found in /var/www/illumine/vendor/sabre/dav/tests/Sabre/DAV/Mock/PropertiesCollection.php:15 Stack trace: #0 {main} thrown in /var/www/illumine/vendor/sabre/dav/tests/Sabre/DAV/Mock/PropertiesCollection.php on line 15