lyluatex usage

[Víctor Cisneros]

I'm hoping this is the right place to post a question about lyluatex, 
since I can't find a mailing list in that project's site.

Anyway, I used lyluatex plenty of times in the past year in several 
projects, without a problem, but now I can't seem to run a minimal example:


\documentclass[letterpaper]{report}
\usepackage{lyluatex}

\begin{document}
    \lily{c'}
    % \begin{ly}
    %     \relative c' { c d e f g a b c }
    % \end{ly}
\end{document}


All I can get is this error:

/usr/share/texlive/texmf-dist/tex/luatex/luaotfload/luaotfload.sty:5: 
LuaTeX error /usr/share/texmf/tex/latex/lyluatex/lyluatex.lua:1025: 
attempt to index field 'shared' (a nil value) [    \lily{c'}]
/usr/share/texlive/texmf-dist/tex/luatex/luaotfload/luaotfload.sty:5: 
LuaTeX error /usr/share/texmf/tex/latex/lyluatex/lyluatex.lua:1025: 
attempt to index field 'shared' (a nil value) [    \lily{c'}]
/usr/share/texlive/texmf-dist/tex/luatex/luaotfload/luaotfload.sty:5: 
LuaTeX error /usr/share/texmf/tex/latex/lyluatex/lyluatex.lua:663: 
attempt to index local 'self' (a nil value) [    \lily{c'}]


If I attempt to compile the above commented lines, I'll get this:

/usr/share/texlive/texmf-dist/tex/luatex/luaotfload/luaotfload.sty:7: 
Undefined control sequence. [        \relative]
/usr/share/texlive/texmf-dist/tex/luatex/luaotfload/luaotfload.sty:8: 
LuaTeX error /usr/share/texmf/tex/latex/lyluatex/lyluatex.lua:1025: 
attempt to index field 'shared' (a nil value) [    \end{ly}]
/usr/share/texlive/texmf-dist/tex/luatex/luaotfload/luaotfload.sty:8: 
LuaTeX error /usr/share/texmf/tex/latex/lyluatex/lyluatex.lua:1025: 
attempt to index field 'shared' (a nil value) [    \end{ly}]
/usr/share/texlive/texmf-dist/tex/luatex/luaotfload/luaotfload.sty:8: 
LuaTeX error /usr/share/texmf/tex/latex/lyluatex/lyluatex.lua:663: 
attempt to index local 'self' (a nil value) [    \end{ly}]


I'm using TeXlive 2015 and lilypond 2.19.49, compiling with 
-shell-escape option.

Thank you very much for your help.

Victor.