Question-and-Answer Resource for the Building Energy Modeling Community
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You may also try with a backup copy of your osm file the following:
Within Sketchup go to:
Extensions\OpenStudio User Scripts\Alter or Add Model Elements\Remove Orphan SubSurfaces
Then you may have to redraw your main surfaces. If surfaces are not coplanar (for example all surface vertices are in the same plane, ie the Z coordinate is the same for all vertices), then errors can occur.
