It crashes on lines 90 (or 99 or 105) when calling makeItem or makeSupplementaryView.
(The attached source was because the original posting interface wouldn't let me submit that long a post with code inline.)
mbarriault
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That's done in the attached source in makeNSView
				view.register(HostingCellView.self, forItemWithIdentifier: Cell.reuseIdentifier)
				view.register(HostingSupplementaryView.self, forSupplementaryViewOfKind: Self.headerIdentifier, withIdentifier: Header.reuseIdentifier)
				view.register(HostingSupplementaryView.self, forSupplementaryViewOfKind: Self.footerIdentifier, withIdentifier: Footer.reuseIdentifier)