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This error means that the surface matching resulted in a window or door that extends beyond the base surface. I would save a copy of your current OSM (just in case) and then try running the diagnostic user script:

1. Save your OSM file as a new name to avoid overwriting your original file that may not have any issues
2. Quit and restart SketchUp (don't open the new file yet)
3. Go to the "Plugins" menu and then under "OpenStudio User Scripts/Reports" look for "OSM Diagnostic Script"
4. Now browse to the new file you saved in step 1. and click ok.
5. There are two options for removing objects with errors or warnings. The defaults of "true" and "false" are fine, but if you have lost of tiny surfaces you want to remove then setting both to true may be good

If that fails, as a last resort you can open your OSM file in a text editor and delete the 'Sub Surface 3' object.