Sync error message - how to resolve?

I have started receiving these error messages; was not getting them before. What should I do to resolve? Thanks.

[CardDAV] Sync of XXX@mac.com/Contacts failed due to the following error: XXX@mac.com (Service Unavailable)

It is an iCloud server error.

We have already implemented a workaround for this, and it will be in the next release.

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