Or maybe I can’t. The format-specific error appears to not come from epsfile, but from the Lilypond parser, so this means that the input is not correct. This happes with \ instead of \\ or /.
From the list-ref error I gathered: eps-file->stencil reads the eps, discards anything after the first null character, and then calculates the dimesions of the eps. These dimensions are then accessed by list-ref. Now, if calculating the bounds fails (probably because the file does not have valid postscript code) this returns #f, so all the list-refs fail. So you might want to check if your eps-file is in fact a valid eps file. Can you attach the eps file you’re using? Cheers, Valentin
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