iCloud CalDAV service unavailable

Recently I’m having errors in the Sync Log for Calendar and Tasks data with icloud.  [CalDav] Sync of ****@me.com failed due to the following error:  ****@me.com (Service Unavailable)

My email and Contacts have been syncing just fine.

I’ve uninstalled and reinstalled emClient and also deleted my whole iCloud account and re-added it.  Nothing seems to work.

Any ideas?