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