> I'm having the same problem.There's already a thread about this: 
> [https://lists.gnu.org/archive/html/lilypond-user/2023-06/msg00135.html](https://lists.gnu.org/archive/html/lilypond-user/2023-06/msg00135.html)
> Joshua Armenta posted a solution, something to do with Ghostscript, but I 
> couldn't make it to work.

That thread is not about the same problem as this thread.

Your specific Ghostscript error is

```
Error: /undefined in finddevice
```

The problem is that recently, Ghostscript (the software used by LilyPond to 
convert its PostScript output to PDF) had a “security fix release”, version 
10.02.1, which removed a function that was used by LilyPond (apparently because 
it was somehow found to be insecure). See [issue 
6675](https://gitlab.com/lilypond/lilypond/-/issues/6675).

Since security fix releases are always assumed not to break anything, packagers 
pick them up without much thought. In this case, Homebrew was quick to upgrade 
to 10.02.1 and LilyPond broke.

LilyPond has already been changed to avoid using it, but Homebrew doesn't have 
that fix yet.

I don't know enough about Homebrew to say whether it's possible to downgrade 
Ghostscript to 10.02.0. You could try the [official 
binaries](https://lilypond.org/download.html), which do work.

Best,

Jean

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