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For general OpenStudio debugging see this question. It sounds like you're using the SketchUp Plugin and have a geometry error, possibly an orphaned window.

• In SketchUp run the Remove Orphan Subsurfaces script
• Use the Search Surfaces button in the Plugin to search for subsurfaces (windows) with the name noted in the error message
• If the search finds the subsurface and it's not part of the model, delete it.