Comment #1 on issue 2487 by [email protected]: Lyx integration of lilypond
http://code.google.com/p/lilypond/issues/detail?id=2487
Almost certainly the result of the PDF file still being open in the viewer. If there's a lock on the file in windows, GhostScript can't recreate it and sends this cryptic error message. Close the PDF file and try again.
