BlenderBIM - KeyError: 'IfcCalendarDate'

NigelNigel
in General

Hi, I am hoping that with community help I can upgrade (IFC2x3 to IFC4) and import two IFC files (see below) that are giving the attached error message. In addition, I am hoping to learn why this is happening with these Archicad generated IFCs. Thank you in advance

Ace
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