use lilypond 2.27 and be compatibel to 2.26

private_includes/base/verses_with_chords.ily

@@ -89,7 +89,7 @@
      (if (and (string? arg) (string-null? arg))
          " "
          #{\markup
-           \score { \new Lyrics { \lyricmode { #(if (ly:music? arg) arg #{ \set stanza = #arg #}) "" } } \layout { $verselayout #(customized-layout verselayout) } }
+           \score { \new Lyrics { \lyricmode { #(if (ly:music? arg) arg #{ \stanza #arg #}) "" } } \layout { $verselayout #(customized-layout verselayout) } }
          #}
      )))