java.lang.IllegalArgumentException: Argument not a net.fortuna.ical4j.model.Property

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java.lang.IllegalArgumentException: Argument not a net.fortuna.ical4j.model.Property
at net.fortuna.ical4j.model.PropertyList.add(PropertyList.java:141)
at com.atlassian.confluence.extra.calendar3.calendarstore.PeopleCalendarDataStore$1.transform(PeopleCalendarDataStore.java:315)
at com.atlassian.confluence.extra.calendar3.calendarstore.PeopleCalendarDataStore.getSubCalendarContent(PeopleCalendarDataStore.java:296)
at com.atlassian.confluence.extra.calendar3.calendarstore.PeopleCalendarDataStore.getSubCalendarContent(PeopleCalendarDataStore.java:65)
at com.atlassian.confluence.extra.calendar3.calendarstore.CalendarDataStoreCachingDecorator.getSubCalendarContentFromCalendarDataStore(CalendarDataStoreCachingDecorator.java:265)
at com.atlassian.confluence.extra.calendar3.calendarstore.CalendarDataStoreCachingDecorator.getSubCalendarContent(CalendarDataStoreCachingDecorator.java:207)
at com.atlassian.confluence.extra.calendar3.calendarstore.DelegatingCalendarDataStore.getSubCalendarContent(DelegatingCalendarDataStore.java:144)
at com.atlassian.confluence.extra.calendar3.DefaultCalendarManager.getEvents(DefaultCalendarManager.java:451)

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