caldav subfolder synchronization for folder "outbox" failed

I am seeing the following OPERATIONS error dialog on a number of free ver 7 installations that utilize iCloud. Purchased a ver 7 copy yesterday to see if that would make the problem go away on another installation. Still see the error whenever eMClient is launched.

[caldav] subfolder synchronization for folder “outbox” failed due to the following error: Not found

Thank-you,
Douglas

https://forum.emclient.com/emclient/topics/icloud-an-error-occurred-caldav-subfolder-sync-outbox-fai…

https://forum.emclient.com/emclient/topics/icloud-account-when-syncing-calender