GNU LilyPond 2.25.10 (running Guile 2.2)
Processing `partTromboneI3.ly'
Parsing...
partTromboneI3.ly:7:10: error: cannot find file: `voiceTromboneI.ily'
(search path: `/home/david/lilypond-2.25.10-linux-x86_64/share/lilypond/2.25.10/ly:/home/david/lilypond-2.25.10-linux-x86_64/share/lilypond/2.25.10/ps:/home/david/lilypond-2.25.10-linux-x86_64/share/lilypond/2.25.10/scm:/home/david/lilypond-2.25.10-linux-x86_64/share/lilypond/2.25.10/fonts/otf/:/home/david/lilypond-2.25.10-linux-x86_64/share/lilypond/2.25.10/fonts/svg/:/home/david/LilyLib/:/home/david/LilyLib/margins/:/home/david/LilyLib/parts-midis/:')
\include 
         "voiceTromboneI.ily"
partTromboneI3.ly:10:10: error: cannot find file: `header.ily'
(search path: `/home/david/lilypond-2.25.10-linux-x86_64/share/lilypond/2.25.10/ly:/home/david/lilypond-2.25.10-linux-x86_64/share/lilypond/2.25.10/ps:/home/david/lilypond-2.25.10-linux-x86_64/share/lilypond/2.25.10/scm:/home/david/lilypond-2.25.10-linux-x86_64/share/lilypond/2.25.10/fonts/otf/:/home/david/lilypond-2.25.10-linux-x86_64/share/lilypond/2.25.10/fonts/svg/:/home/david/LilyLib/:/home/david/LilyLib/margins/:/home/david/LilyLib/parts-midis/:')
\include 
         "header.ily"
partTromboneI3.ly:24:33: error: unknown command: `\voiceTromboneI'
				
                                \voiceTromboneI
partTromboneI3.ly:24:33: error: string outside of text script or \lyricmode
				
                                \voiceTromboneI
partTromboneI3.ly:35:20: error: cannot find file: `../../Include/paper.bookTitleMarkup.ily'
(search path: `/home/david/lilypond-2.25.10-linux-x86_64/share/lilypond/2.25.10/ly:/home/david/lilypond-2.25.10-linux-x86_64/share/lilypond/2.25.10/ps:/home/david/lilypond-2.25.10-linux-x86_64/share/lilypond/2.25.10/scm:/home/david/lilypond-2.25.10-linux-x86_64/share/lilypond/2.25.10/fonts/otf/:/home/david/lilypond-2.25.10-linux-x86_64/share/lilypond/2.25.10/fonts/svg/:/home/david/LilyLib/:/home/david/LilyLib/margins/:/home/david/LilyLib/parts-midis/:')
	  \include 
                   "../../Include/paper.bookTitleMarkup.ily"

Note: compilation failed and \version outdated, did you
update input syntax with convert-ly?

  https://lilypond.org/doc/v2.25/Documentation/usage/updating-files-with-convert_002dly

Interpreting music...[8]
Preprocessing graphical objects...
Finding the ideal number of pages...
Fitting music on 1 page...
Drawing systems...
Converting to `partTromboneI3.pdf'...
fatal error: failed files: "partTromboneI3.ly"