"can't transparently output node at top level"

[Larry Kollar]

I pulled the latest down, and did “make.” Things went OK until I got down to 
the documentation:

>   GROFF    contrib/mom/examples/letter.pdf
> troff: contrib/mom/examples/letter.mom:12: error: can't transparently output 
> node at top level
>   GROFF    contrib/mom/examples/mom-pdf.pdf
> troff: contrib/mom/examples/mom-pdf.mom:20: error: can't transparently output 
> node at top level
> troff: contrib/mom/examples/mom-pdf.mom:149: error: can't transparently 
> output node at top level
> troff: contrib/mom/examples/mom-pdf.mom:580: error: can't transparently 
> output node at top level
> troff: contrib/mom/examples/mom-pdf.mom:580: error: can't transparently 
> output node at top level
> troff: contrib/mom/examples/mom-pdf.mom:580: error: can't transparently 
> output node at top level
> troff: contrib/mom/examples/mom-pdf.mom:580: error: can't transparently 
> output node at top level
> troff: contrib/mom/examples/mom-pdf.mom:580: error: can't transparently 
> output node at top level
> troff: contrib/mom/examples/mom-pdf.mom:580: error: can't transparently 
> output node at top level
> troff: contrib/mom/examples/mom-pdf.mom:580: error: can't transparently 
> output node at top level
> troff: contrib/mom/examples/mom-pdf.mom:580: error: can't transparently 
> output node at top level
>   GROFF    contrib/mom/examples/mon_premier_doc.pdf
> troff: contrib/mom/examples/mon_premier_doc.mom:13: error: can't translate 
> character code 233 to special character ''e' in transparent throughput
> troff: contrib/mom/examples/mon_premier_doc.mom:28: error: can't 
> transparently output node at top level
> troff: contrib/mom/examples/mon_premier_doc.mom:30: error: can't translate 
> character code 233 to special character ''e' in transparent throughput
> troff: contrib/mom/examples/mon_premier_doc.mom:108: error: can't translate 
> character code 233 to special character ''e' in transparent throughput
> troff: contrib/mom/examples/mon_premier_doc.mom:136: error: can't translate 
> character code 232 to special character '`e' in transparent throughput
>   GROFF    contrib/mom/examples/sample_docs.pdf
> troff: contrib/mom/examples/sample_docs.mom:130: error: can't transparently 
> output node at top level
> troff: contrib/mom/examples/sample_docs.mom:300: error: can't transparently 
> output node at top level
> troff: contrib/mom/examples/sample_docs.mom:479: error: can't transparently 
> output node at top level
>   GROFF    contrib/mom/examples/typesetting.pdf
>   GROFF    contrib/mom/examples/slide-demo.pdf
> troff: contrib/mom/examples/slide-demo.mom:83: error: can't transparently 
> output node at top level
>   GROFF    contrib/mom/examples/copyright-default.pdf
> troff: contrib/mom/examples/copyright-default.mom:61: error: can't 
> transparently output node at top level
> troff: contrib/mom/examples/copyright-default.mom:89: error: can't 
> transparently output node at top level
>   GROFF    contrib/mom/examples/copyright-chapter.pdf
> troff: contrib/mom/examples/copyright-chapter.mom:62: error: can't 
> transparently output node at top level
> troff: contrib/mom/examples/copyright-chapter.mom:93: error: can't 
> transparently output node at top level
>   GROFF    doc/meref.ps
>   GROFF    doc/meintro.ps
>   GROFF    doc/meintro_fr.ps
>   GROFF    doc/ms.ps
>   GROFF    doc/pic.ps
>   GROFF    contrib/pdfmark/pdfmark.pdf
> GPL Ghostscript 9.26: Unrecoverable error, exit code 1

Any idea what’s happening? Running MacOS 10.15.7, if that makes a difference.

— Larry