Fatal error: Uncaught Error: Class "Sabre\CalDAV\Schedule\IMipPlugin" not found in /var/www/illumine/vendor/sabre/dav/tests/Sabre/CalDAV/Schedule/IMip/MockPlugin.php:19 Stack trace: #0 {main} thrown in /var/www/illumine/vendor/sabre/dav/tests/Sabre/CalDAV/Schedule/IMip/MockPlugin.php on line 19