org-caldav thinks calendar is empty

[lrochfort]

I'm trying to sync against a caldav URI that I use in all my other Calendar clients, but unfortunately org-caldav tells me the calendar is empty.

Debug log is:

========== Started sync. ========== Started sync. Check connection for https:/XXXXX/caldav/st/home/YYYYY/calendars/MyCalendar/. This is an empty calendar. Setting flag. Generating ICS file /tmp/org-caldav-22352bwi. === Updating EventDB from Org === Updating EventDB from Cal === Updating events in calendar === Updating events in Org

[sanderboer]

I have the same issue: Check connection for http://caldav.foobar.nl/caldav.php/foo/calendar/. This is an empty calendar. Setting flag. Generating ICS file /tmp/org-caldav-12432vH0. === Updating EventDB from Org === Updating EventDB from Cal === Updating events in calendar === Updating events in Org

If I open http://caldav.foobar.nl/caldav.php/foo/calendar/. in the browser I get a nice calendar file. How can I debug further ? Caldav server is davical.