Starting lilypond 2.24.1 [modulation-scale.ly]...
Processing `/home/jakob/Downloads/harmonyli.ly-master/modulation-scale.ly'
Parsing...
/home/jakob/Downloads/harmonyli.ly-master/modulation-scale.ly:34:24: error: syntax error, unexpected ',', expecting '.' or '='
  system-system-spacing
                       , basic-distance = #20
/home/jakob/Downloads/harmonyli.ly-master/modulation-scale.ly:101:24: warning: deprecated: missing `.' in property path NoteColumn.ignore-collision
  \override NoteColumn 
                       #'ignore-collision = ##t
/home/jakob/Downloads/harmonyli.ly-master/harmonyli.ly:710:34: warning: deprecated: missing `.' in property path TextSpanner.direction
     \once \override TextSpanner 
                                 #'direction = #DOWN
/home/jakob/Downloads/harmonyli.ly-master/harmonyli.ly:711:34: warning: deprecated: missing `.' in property path TextSpanner.style
     \once \override TextSpanner 
                                 #'style = #'line
/home/jakob/Downloads/harmonyli.ly-master/harmonyli.ly:712:34: warning: deprecated: missing `.' in property path TextSpanner.outside-staff-priority
     \once \override TextSpanner 
                                 #'outside-staff-priority = ##f
/home/jakob/Downloads/harmonyli.ly-master/harmonyli.ly:713:34: warning: deprecated: missing `.' in property path TextSpanner.padding
     \once \override TextSpanner 
                                 #'padding = #-0.6 % sets the distance of the line from the lyrics
/home/jakob/Downloads/harmonyli.ly-master/harmonyli.ly:714:34: warning: deprecated: missing `.' in property path TextSpanner.bound-details
     \once \override TextSpanner 
                                 #'bound-details =
/home/jakob/Downloads/harmonyli.ly-master/modulation-scale.ly:171:11: error: unknown escaped string: `\partcombine'
          
          \partcombine \voiceA \voiceT
/home/jakob/Downloads/harmonyli.ly-master/modulation-scale.ly:171:11: error: string outside of text script or \lyricmode
          
          \partcombine \voiceA \voiceT

Note: compilation failed and \version outdated, did you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

  https://lilypond.org/doc/v2.24/Documentation/usage/updating-files-with-convert_002dly

Interpreting music...[8]
Preprocessing graphical objects...
Interpreting music...
MIDI output to `modulation-scale.midi'...
Finding the ideal number of pages...
Fitting music on 1 page...
Drawing systems...
Converting to `modulation-scale.pdf'...
fatal error: failed files: "/home/jakob/Downloads/harmonyli.ly-master/modulation-scale.ly"
Exited with return code 1.