It throws another error every time it syncs. Frustrating to have the dialog pop up each time so I can ignore the error. Seems to be pulling calendar info just fine.
Detail from my log:
2:35:37 PM Jesse (Calendar) [CalDAV / CardDAV] MailClient.Storage.Application.OperationException: Sync of Jesse (Calendar)/ failed due to the following error: Jesse (Calendar) (Forbidden)
2:35:37 PM <?xml version='1.0' encoding='UTF-8'?>
2:35:37 PM <error xmlns="DAV:"></error>
2:35:37 PM <supported-report></supported-report>
2:35:37 PM
2:35:37 PM Jesse (Calendar) [CalDAV / CardDAV] Synchronizing items: Sync of Jesse (Calendar)/ finished: 0 uploaded, 0 deleted, 0 obsolete, 0 items, 0 downloaded
2:35:37 PM Jesse (Calendar) [CalDAV / CardDAV] Synchronizing items: Done