lilypond-book: warning: cannot detect textwidth from LaTeX

[Xirux Nefer]

I am using lilypond-book to compile solfeo.lytex:

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\documentclass[12pt,a4paper]{book}
\usepackage[textwidth=12cm,textheight=20cm]{geometry}
\usepackage{lipsum}
\usepackage{fontspec}
\usepackage{Alegreya}
\begin{document}
\lipsum[1]
\lilypondfile[indent=1\cm,fontload,ragged-right]{scores/Lesson_1.01.xml.ly}
\lipsum[2-4]
\end{document}

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Using:

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lilypond-book --output=out --latex-program=xelatex --left-padding=0
--process='lilypond --define-default=line-width=12\cm' solfeo.lytex

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And I  am getting the error in the subject of this message. The output of
the compilation is:

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lilypond-book (GNU LilyPond) 2.18.2
Reading solfeo.lytex...
Running `xelatex' on file `/tmp/tmpy8LoN0.tex' to detect default page settings.

lilypond-book: warning: Unable to auto-detect default settings:
xelatex: /home/admin/lilypond/usr/lib/libpng12.so.0: no version information
available (required by xelatex)
xelatex: /home/admin/lilypond/usr/lib/libstdc++.so.6: no version information
available (required by xelatex)
xelatex: /home/admin/lilypond/usr/lib/libstdc++.so.6: no version information
available (required by xelatex)
xelatex: /home/admin/lilypond/usr/lib/libstdc++.so.6: no version information
available (required by xelatex)
xelatex: /home/admin/lilypond/usr/lib/libstdc++.so.6: no version information
available (required by xelatex)
xelatex: /home/admin/lilypond/usr/lib/libstdc++.so.6: no version information
available (required by /usr/lib/x86_64-linux-gnu/libicuuc.so.52)
xelatex: /home/admin/lilypond/usr/lib/libstdc++.so.6: no version information
available (required by /usr/lib/x86_64-linux-gnu/libicuuc.so.52)
xelatex: /home/admin/lilypond/usr/lib/libpng12.so.0: no version information
available (required by /usr/lib/x86_64-linux-gnu/libpoppler.so.44)
xelatex: /home/admin/lilypond/usr/lib/libstdc++.so.6: no version information
available (required by /usr/lib/x86_64-linux-gnu/libpoppler.so.44)
xelatex: /home/admin/lilypond/usr/lib/libstdc++.so.6: no version information
available (required by /usr/lib/x86_64-linux-gnu/libpoppler.so.44)
Fontconfig error: Cannot load default config file
xelatex: symbol lookup error: /usr/lib/x86_64-linux-gnu/libharfbuzz.so.0:
undefined symbol: g_unicode_script_to_iso15924

lilypond-book: warning: cannot detect textwidth from LaTeX
Dissecting...
Writing snippets...
lilypond-book: warning: ignoring unknown ly option: fontload
Processing...
Running lilypond...
GNU LilyPond 2.18.2
advertencia: no existe la opción interna line-width
Procesando «snippet-map-4684781841145640542.ly»
Analizando...
Procesando «solfeo.lytex»
Analizando...
Renombrando la entrada a: «scores/Lesson_1.01.xml.ly»
advertencia: los márgenes no caben en este ancho de línea, fijando valores
predeterminados
Interpretando la música...[8]
Preprocesando los objetos gráficos...
Calculando los saltos de línea... 
Dibujando los sistemas... 
Salida de la página hacia «d5/lily-084a2839.eps»...
Salida de la página hacia «d5/lily-084a2839-1.eps»...
Salida de la página hacia «d5/lily-084a2839-2.eps»...
Escribiendo «d5/lily-084a2839-systems.texi»...
Escribiendo «d5/lily-084a2839-systems.tex»...
Escribiendo «d5/lily-084a2839-systems.count»...
Enhorabuena. La compilación se ha completado satisfactoriamente.
Linking files...
Compiling /media/admin/DATOS/Dropbox/code/solfeo-book/out/solfeo.tex...
Writing `/media/admin/DATOS/Dropbox/code/solfeo-book/out/solfeo.tex'...

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Cheers