Fatal error: Uncaught Error: Interface "Sabre\DAVACL\IPrincipal" not found in /home/ternalis/agenda/vendor/sabre/dav/lib/CalDAV/Principal/IProxyRead.php:19 Stack trace: #0 {main} thrown in /home/ternalis/agenda/vendor/sabre/dav/lib/CalDAV/Principal/IProxyRead.php on line 19