ICloud, when tries to sync with iCal reverts with the following message The server responded with "509" to operation CalDAVWriteEntityQueueableOperation. It would not sync my calendars.Any ideas how to fix it?

iCloud, when tries to sync with iCal reverts with the following message The server responded with “509” to operation CalDAVWriteEntityQueueableOperation. It would not sync my calendars. Any ideas how to fix it? Thanks.

Same issue here, hope someone has a clue how to solve this.

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