I have the same experience on my evolution. I am using synology caldav server (latest) and this hasn't been working for me for some time (around a year or more). I have been running the latest ubuntu, and presently I'm on 18.04. The attached log is from evolution v3.28.1-2 calendar-factory in debug-all mode.
** Attachment added: "Failure creating caledar object output from command "CALDAV_DEBUG=all /usr/lib/evolution/evolution-calendar-factory"" https://bugs.launchpad.net/ubuntu/+source/evolution/+bug/1723080/+attachment/5135617/+files/evolution_bug_1723080.log -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to evolution in Ubuntu. https://bugs.launchpad.net/bugs/1723080 Title: Caldav Issues with evolution 3.26 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/evolution/+bug/1723080/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
