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… cannot be cast to net.fortuna.ical4j.model.Property.Uid
Looks like a bug to me.
Version 1.8.3-gplay-gplay
Duplicate of https://forums.bitfire.at/post/11619?
Thanks for your report.
Duplicate of #170, please follow up there.
#578 is caused by https://github.com/owncloud/contacts/issues/581 which is present since at least OwnCloud 6.0.3.
Please follow up in the issues mentioned above.
Same as https://forums.bitfire.at/post/8531, will be fixed in next version