Dear Brother,

> Underfull \hbox (badness 10000) in paragraph at lines 4--404 [] ) !
> I can't write on file `main-lualatex.pdf'.

I know this is surprising and unusual for long-time Windows users, but
error messages usually are meant to be useful under non-Microsoft OSs,
especially in free software, so my advice would be to read them.

Indeed, in the first message you sent, there was this in the output:

> Module gregoriotex error: 
> Something went
> wrong when executing 'gregorio -o 
> PopulusSion-3_0_0-rc2.gtex PopulusSion.gabc'. 
> shell-escape mode may not be activated. Try
> 'lualatex --shell-escape main-lualatex.tex'
> See the documentation of gregorio or your TeX
> distribution to automatize it.

reading it would have given you a lead on the solution that Henry gave you.

Also, in your error message, there is:

> ! I can't write on file `main-lualatex.pdf'.

Which looks like TeX cannot write in file main-lualatex.pdf, maybe
because of an access restriction... I have no idea how user right on
directories work under Windows, but maybe it would be worth inspecting
this: does the user launching the command have enough rights to create a
file? Can it overwrite main-lualatex.pdf? Try deleting it if it exists,
to see if there is a difference.

Thank you,
-- 
Elie

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