Fatal error: Uncaught Error: Class 'Sabre\DAV\SimpleCollection' not found in /home/malert/WebDAV/vendor/sabre/dav/tests/Sabre/DAV/Sync/MockSyncCollection.php:17 Stack trace: #0 {main} thrown in /home/malert/WebDAV/vendor/sabre/dav/tests/Sabre/DAV/Sync/MockSyncCollection.php on line 17