Hi, I am getting the following system exception when trying to sync with my NextCloud calendar. I am not sure if this is a bug with OneCalendar or if the site really sends wrong data.
The effect could have been caused by moving (by dragging) a calendar entry to another day/time. The move went visually ok but when I opened the moved entry, it still showed the old date/time, if I remember correctly. The following sync showed the error, and this is now happening with every sync operation.