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Google Calendar and iCal: Cannot Delete or Modify Recurring Event

Getting "HTTP/1.1 409 Sequence number cannot be less than current value" error? Try deleting the whole calendar in iCal and adding it again.

via Issue 64 - google-caldav-issues - Cannot update recurring Events ->Response: 500 server error code 35df1847 - A place to track issues for Google Calendar's CalDAV server. - Google Project Hosting.