Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
Open the .osm file in a text editor and delete the offending surfaces (Sub Surface 2 and Surface 503). Then re-open in Sketchup and re-do that portion of the geometry. My guess is this is the result of a wall that is slightly off from being a plane, and the window on it can't anchor to a non-planar surface.
