Problem inserting from some SketchUp files

With a newly opened LayOut drawing template, when I try to insert a window to a SketchUp file I am finding that the choice dialogue box shows current SketchUp files are greyed and un-clickable whereas older files are clickable and insertable. What’s my problem?

Make sure that you don’t start an old Layout (e.g. 2014) if you want to insert a new SketchUp file (e.g. 2015).