We are getting these type of errors.
ocal Failures were detected. No action is required.
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Sync Type: Delta Sync

Sync Token: 163950

Store: Zimbra - (username goes here)

Computer Name: ORG-BES

Version: 5.0.2711.18

Error IDs:
id (62867) type(appointment) message([Subject: Bi-weekly feedback session]
[Details: COM Exception HRESULT: -2147221223. ])

WHat could be causing theese errors and is there anything we can do to prevent them?