I’ve been using the built-in calendar server OS X Snow Leopard Server offers since day one. Paired with the address book service it saved me from spending another $99/yr on the MobileMe service. However, for the past month or so, the web interface hasn’t been working and will continually sit at the ‘Getting Events’ screen. Today I finally got around to checking through some error logs, specifically /var/log/caldavd/error.log. The following was the error I was getting:

2010-02-01 22:26:59-0600 [-] [caldav-8010] vobject.base.ValidateError: 'VEVENT components cannot contain both DTEND and DURATION components'

After searching around I came across this post on the Apple Discussion Forums. Something interesting to take note of is, the event was added/modified from the web interface (the product id):

PRODID:-//Apple Inc.//Web Calendar Client//

So that seems to lead me to believe there’s actually a bug within the web interface that isn’t setting the right parameters in the events. The fix is to remove the DURATION and replace it with DTEND (if it doesn’t already exist). What I did to find any events with DURATION was a simple grep:

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sh-3.2# grep -ir DURATION /Library/CalendarServer/Documents/calendars/__uids__/

Then you can use your favorite editor to remove the DURATION line. Before making edits, I recommend stopping the calendar service, edit, then start it back up.

This resolved my issue, so hopefully it can assist anyone else with a broken web iCal interface.