Fatal error: Uncaught Error: Interface "Sabre\CardDAV\Backend\BackendInterface" not found in /usr/home/wdzaizai2/domains/tc.wdz.ddns-ip.net/public_html/vendor/sabre/dav/lib/CardDAV/Backend/SyncSupport.php:23
Stack trace:
#0 {main}
  thrown in /usr/home/wdzaizai2/domains/tc.wdz.ddns-ip.net/public_html/vendor/sabre/dav/lib/CardDAV/Backend/SyncSupport.php on line 23