Support for gregorio 5 (original title: ERROR: 'lualatex' exited with exit code 256)

[BeyondTheHorizon]

When I try to preview a .gly file, the title error appears in the terminal. This is what the log file says:

This is LuaTeX, Version 1.0.4 (MiKTeX 2.9.6400 64-bit)  (format=lualatex 2017.9.2)  2 SEP 2017 06:38
 restricted system commands enabled.
**test.tex
(./test.tex
LaTeX2e <2017-04-15>
Lua module: luaotfload-main 2017/01/29 2.80001 OpenType layout system.
Lua module: lualibs 2017-02-01 2.5 ConTeXt Lua standard libraries.
Lua module: lualibs-extended 2017-02-01 2.5 ConTeXt Lua libraries -- extended co
llection.(using cache: C:/Users/rmurdoch/AppData/Local/MiKTeX/2.9/luatex-cache/g
eneric)
luaotfload | conf : Root cache directory is C:/Users/rmurdoch/AppData/Local/MiKT
eX/2.9/luatex-cache/generic/names.
luaotfload | init : Loading fontloader “fontloader-2017-02-11.lua” from kpse
-resolved path “C:/Program Files/MiKTeX 2.9/tex/luatex/luaotfload/fontloader-2
017-02-11.lua”.
Lua-only attribute luaotfload@state = 1
Lua-only attribute luaotfload@noligature = 2
Lua-only attribute luaotfload@syllabe = 3
luaotfload | init : Context OpenType loader version “3.027”
Inserting `luaotfload.node_processor' at position 1 in `pre_linebreak_filter'.
Inserting `luaotfload.node_processor' at position 1 in `hpack_filter'.
Inserting `luaotfload.define_font' at position 1 in `define_font'.
Lua-only attribute luaotfload_color_attribute = 4
luaotfload | conf : Root cache directory is C:/Users/rmurdoch/AppData/Local/MiKT
eX/2.9/luatex-cache/generic/names.
Inserting `luaotfload.aux.set_sscale_dimens' at position 1 in `luaotfload.patch_
font'.
Inserting `luaotfload.aux.patch_cambria_domh' at position 2 in `luaotfload.patch
_font'.
Inserting `luaotfload.aux.fixup_fontdata' at position 1 in `luaotfload.patch_fon
t_unsafe'.
Inserting `luaotfload.aux.set_capheight' at position 3 in `luaotfload.patch_font
'.
Inserting `luaotfload.rewrite_fontname' at position 4 in `luaotfload.patch_font'
.
luaotfload | main : initialization completed in 0.375 seconds
Babel <3.12> and hyphenation patterns for 1 language(s) loaded.
("C:/Program Files/MiKTeX 2.9/tex/latex/base/article.cls"
Document Class: article 2014/09/29 v1.4h Standard LaTeX document class
("C:/Program Files/MiKTeX 2.9/tex/latex/base/size12.clo"
File: size12.clo 2014/09/29 v1.4h Standard LaTeX file (size option)
luaotfload | db : Font names database loaded from C:/Users/rmurdoch/AppData/Loca
l/MiKTeX/2.9/luatex-cache/generic/names/luaotfload-names.luc(load luc: C:/Users/
rmurdoch/AppData/Local/MiKTeX/2.9/luatex-cache/generic/fonts/otl/lmroman12-regul
ar.luc))
\c@part=\count79
\c@section=\count80
\c@subsection=\count81
\c@subsubsection=\count82
\c@paragraph=\count83
\c@subparagraph=\count84
\c@figure=\count85
\c@table=\count86
\abovecaptionskip=\skip41
\belowcaptionskip=\skip42
\bibindent=\dimen102
) ("C:/Program Files/MiKTeX 2.9/tex/generic/babel/babel.sty"
Package: babel 2017/06/29 3.12 The Babel package

("C:/Program Files/MiKTeX 2.9/tex/generic/babel/switch.def"
File: switch.def 2017/06/29 3.12 Babel switching mechanism
)
("C:/Program Files/MiKTeX 2.9/tex/generic/babel/luababel.def"
\l@afrikaans=\language2
Package babel Info: Non-standard hyphenation setup on input line 128.
\l@ancientgreek=\language3
\l@arabic=\language4
\l@armenian=\language5
\l@assamese=\language6
\l@basque=\language7
\l@bengali=\language8
\l@bokmal=\language9
\l@bulgarian=\language10
\l@catalan=\language11
\l@classiclatin=\language12
\l@coptic=\language13
\l@croatian=\language14
\l@czech=\language15
\l@danish=\language16
\l@dutch=\language17
\l@esperanto=\language18
\l@estonian=\language19
\l@farsi=\language20
\l@finnish=\language21
\l@french=\language22
\l@galician=\language23
\l@georgian=\language24
\l@german=\language25
\l@german-x-2017-03-31=\language26
\l@greek=\language27
\l@gujarati=\language28
\l@hindi=\language29
\l@hungarian=\language30
\l@icelandic=\language31
\l@indonesian=\language32
\l@interlingua=\language33
\l@irish=\language34
\l@italian=\language35
\l@kannada=\language36
\l@kurmanji=\language37
\l@latin=\language38
\l@latvian=\language39
\l@lithuanian=\language40
\l@malayalam=\language41
\l@marathi=\language42
\l@mongolian=\language43
\l@mongolianlmc=\language44
\l@monogreek=\language45
\l@ngerman=\language46
\l@ngerman-x-2017-03-31=\language47
\l@nynorsk=\language48
\l@oriya=\language49
\l@panjabi=\language50
\l@piedmontese=\language51
\l@pinyin=\language52
\l@polish=\language53
\l@portuguese=\language54
\l@romanian=\language55
\l@romansh=\language56
\l@russian=\language57
\l@sanskrit=\language58
\l@serbian=\language59
\l@serbianc=\language60
\l@slovak=\language61
\l@slovenian=\language62
\l@spanish=\language63
\l@swedish=\language64
\l@swissgerman=\language65
\l@tamil=\language66
\l@telugu=\language67
\l@thai=\language68
\l@turkish=\language69
\l@turkmen=\language70
\l@ukenglish=\language71
\l@ukrainian=\language72
\l@uppersorbian=\language73
\l@usenglishmax=\language74
\l@welsh=\language75
)
*************************************
* Local config file bblopts.cfg used
*
("C:/Program Files/MiKTeX 2.9/tex/latex/arabi/bblopts.cfg"
File: bblopts.cfg 2005/09/08 v0.1 add Arabic and Farsi to "declared" options of 
babel
)
("C:/Program Files/MiKTeX 2.9/tex/latex/babel-latin/latin.ldf"
Language: latin 2015/08/20 v.3.5 Latin support from the babel system

("C:/Program Files/MiKTeX 2.9/tex/generic/babel/babel.def"
File: babel.def 2017/06/29 3.12 Babel common definitions

("C:/Program Files/MiKTeX 2.9/tex/generic/babel/switch.def"
File: switch.def 2017/06/29 3.12 Babel switching mechanism
)
\babel@savecnt=\count87
\U@D=\dimen103

("C:/Program Files/MiKTeX 2.9/tex/generic/babel/luababel.def"))
Package babel Info: Making " an active character on input line 188.

("C:/Program Files/MiKTeX 2.9/tex/generic/hyph-utf8/loadhyph/loadhyph-la.tex"
UTF-8 Latin hyphenation patterns
("C:/Program Files/MiKTeX 2.9/tex/generic/hyph-utf8/patterns/tex/hyph-la.tex")))
) ("C:/Program Files/MiKTeX 2.9/tex/latex/geometry/geometry.sty"
Package: geometry 2010/09/12 v5.6 Page Geometry

("C:/Program Files/MiKTeX 2.9/tex/latex/graphics/keyval.sty"
Package: keyval 2014/10/28 v1.15 key=value parser (DPC)
\KV@toks@=\toks14
)
("C:/Program Files/MiKTeX 2.9/tex/generic/oberdiek/ifpdf.sty"
Package: ifpdf 2017/03/15 v3.2 Provides the ifpdf switch
)
("C:/Program Files/MiKTeX 2.9/tex/generic/oberdiek/ifvtex.sty"
Package: ifvtex 2016/05/16 v1.6 Detect VTeX and its facilities (HO)
Package ifvtex Info: VTeX not detected.
)
("C:/Program Files/MiKTeX 2.9/tex/generic/ifxetex/ifxetex.sty"
Package: ifxetex 2010/09/12 v0.6 Provides ifxetex conditional
)
\Gm@cnth=\count88
\Gm@cntv=\count89
\c@Gm@tempcnt=\count90
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\Gm@layoutwidth=\dimen108
\Gm@layoutheight=\dimen109
\Gm@layouthoffset=\dimen110
\Gm@layoutvoffset=\dimen111
\Gm@dimlist=\toks15

("C:/Program Files/MiKTeX 2.9/tex/latex/geometry/geometry.cfg"))
("C:/Program Files/MiKTeX 2.9/tex/latex/fontspec/fontspec.sty"
("C:/Program Files/MiKTeX 2.9/tex/latex/l3kernel/expl3.sty"
Package: expl3 2017/07/19 L3 programming layer (loader) 

("C:/Program Files/MiKTeX 2.9/tex/latex/l3kernel/expl3-code.tex"
Package: expl3 2017/07/19 L3 programming layer (code)
\ucharcat@table=\catcodetable5
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\g_tmpb_skip=\skip48
\c_zero_muskip=\muskip10
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\l_tmpa_muskip=\muskip12
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\l_keys_choice_int=\count103
\c__fp_leading_shift_int=\count104
\c__fp_middle_shift_int=\count105
\c__fp_trailing_shift_int=\count106
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\c__fp_big_middle_shift_int=\count108
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\c__fp_Bigg_leading_shift_int=\count110
\c__fp_Bigg_middle_shift_int=\count111
\c__fp_Bigg_trailing_shift_int=\count112
\c__fp_rand_size_int=\count113
\c__fp_rand_four_int=\count114
\c__fp_rand_eight_int=\count115
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\l__tl_build_start_index_int=\count127
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\l__regex_mode_int=\count138
\c__regex_cs_in_class_mode_int=\count139
\c__regex_cs_mode_int=\count140
\l__regex_catcodes_int=\count141
\l__regex_default_catcodes_int=\count142
\c__regex_catcode_L_int=\count143
\c__regex_catcode_O_int=\count144
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\l__regex_curr_char_int=\count158
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\l__regex_last_char_int=\count160
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\l__regex_curr_state_int=\count162
\l__regex_step_int=\count163
\l__regex_min_active_int=\count164
\l__regex_max_active_int=\count165
\l__regex_replacement_csnames_int=\count166
\l__regex_match_count_int=\count167
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\l__regex_submatch_int=\count169
\l__regex_zeroth_submatch_int=\count170
\g__debug_trace_regex_int=\count171
\c_empty_box=\box26
\l_tmpa_box=\box27
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\l__coffin_display_coffin=\box38
\l__coffin_display_coord_coffin=\box39
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\l__coffin_scaled_total_height_dim=\dimen141
\l__coffin_scaled_width_dim=\dimen142
)
("C:/Program Files/MiKTeX 2.9/tex/latex/l3kernel/l3pdfmode.def"
File: l3pdfmode.def 2017/03/18 v L3 Experimental driver: PDF mode
\l__driver_color_stack_int=\count172
\l__driver_tmp_box=\box41
))
("C:/Program Files/MiKTeX 2.9/tex/latex/l3packages/xparse/xparse.sty"
Package: xparse 2017/07/19 L3 Experimental document command parser
\l__xparse_current_arg_int=\count173
\g__xparse_grabber_int=\count174
\l__xparse_m_args_int=\count175
\l__xparse_mandatory_args_int=\count176
\l__xparse_v_nesting_int=\count177
)
Package: fontspec 2017/08/14 v2.6d Font selection for XeLaTeX and LuaLaTeX
Lua module: fontspec 2017/08/14 2.6d Font selection for XeLaTeX and LuaLaTeX
("C:/Program Files/MiKTeX 2.9/tex/latex/fontspec/fontspec-luatex.sty"
Package: fontspec-luatex 2017/08/14 v2.6d Font selection for XeLaTeX and LuaLaTe
X
\l__fontspec_script_int=\count178
\l__fontspec_language_int=\count179
\l__fontspec_strnum_int=\count180
\l__fontspec_tmp_int=\count181
\l__fontspec_em_int=\count182
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\l__fontspec_strong_int=\count184
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\l__fontspec_tmpa_dim=\dimen143
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\l__fontspec_tmpc_dim=\dimen145
\g__file_internal_ior=\read1

("C:/Program Files/MiKTeX 2.9/tex/latex/base/fontenc.sty"
Package: fontenc 2017/04/05 v2.0i Standard LaTeX package

("C:/Program Files/MiKTeX 2.9/tex/latex/base/tuenc.def"
File: tuenc.def 2017/04/05 v2.0i Standard LaTeX file
LaTeX Font Info:    Redeclaring font encoding TU on input line 82.
))
.................................................
. LaTeX info: "xparse/define-command"
. 
. Defining command \fontspec with sig. 'O{}mO{}' on line 477.
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. LaTeX info: "xparse/define-command"
. 
. Defining command \setmainfont with sig. 'O{}mO{}' on line 488.
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. LaTeX info: "xparse/define-command"
. 
. Defining command \setsansfont with sig. 'O{}mO{}' on line 508.
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. LaTeX info: "xparse/define-command"
. 
. Defining command \setmonofont with sig. 'O{}mO{}' on line 528.
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. LaTeX info: "xparse/define-command"
. 
. Defining command \setromanfont with sig. 'O{}mO{}' on line 548.
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. LaTeX info: "xparse/define-command"
. 
. Defining command \setmathrm with sig. 'O{}mO{}' on line 552.
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. LaTeX info: "xparse/define-command"
. 
. Defining command \setboldmathrm with sig. 'O{}mO{}' on line 560.
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. LaTeX info: "xparse/define-command"
. 
. Defining command \setmathsf with sig. 'O{}mO{}' on line 568.
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. LaTeX info: "xparse/define-command"
. 
. Defining command \setmathtt with sig. 'O{}mO{}' on line 576.
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. LaTeX info: "xparse/define-command"
. 
. Defining command \newfontfamily with sig. 'mO{}mO{}' on line 591.
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. LaTeX info: "xparse/define-command"
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. Defining command \newfontface with sig. 'mO{}mO{}' on line 608.
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. LaTeX info: "xparse/define-command"
. 
. Defining command \defaultfontfeatures with sig. 't+om' on line 619.
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. LaTeX info: "xparse/define-command"
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. Defining command \addfontfeatures with sig. 'm' on line 650.
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. LaTeX info: "xparse/define-command"
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. Defining command \newfontfeature with sig. 'mm' on line 677.
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. LaTeX info: "xparse/define-command"
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. Defining command \newAATfeature with sig. 'mmmm' on line 691.
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. LaTeX info: "xparse/define-command"
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. Defining command \newopentypefeature with sig. 'mmm' on line 705.
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. LaTeX info: "xparse/define-command"
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. Defining command \newICUfeature with sig. 'mmm' on line 725.
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. LaTeX info: "xparse/define-command"
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. Defining command \aliasfontfeature with sig. 'mm' on line 729.
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. LaTeX info: "xparse/define-command"
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. Defining command \aliasfontfeatureoption with sig. 'mmm' on line 750.
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. LaTeX info: "xparse/define-command"
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. Defining command \newfontscript with sig. 'mm' on line 783.
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. LaTeX info: "xparse/define-command"
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. Defining command \newfontlanguage with sig. 'mm' on line 787.
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. LaTeX info: "xparse/define-command"
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. Defining command \DeclareFontsExtensions with sig. 'm' on line 791.
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. LaTeX info: "xparse/define-command"
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. Defining command \IfFontFeatureActiveTF with sig. 'mmm' on line 802.
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. LaTeX info: "xparse/define-command"
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. Defining command \EncodingCommand with sig. 'mO{}m' on line 3259.
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. LaTeX info: "xparse/define-command"
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. Defining command \EncodingAccent with sig. 'mm' on line 3265.
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. LaTeX info: "xparse/define-command"
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. Defining command \EncodingSymbol with sig. 'mm' on line 3271.
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. LaTeX info: "xparse/define-command"
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. Defining command \EncodingComposite with sig. 'mmm' on line 3277.
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. LaTeX info: "xparse/define-command"
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. Defining command \EncodingCompositeCommand with sig. 'mmm' on line 3283.
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. LaTeX info: "xparse/define-command"
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. Defining command \DeclareUnicodeEncoding with sig. 'mm' on line 3308.
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. LaTeX info: "xparse/define-command"
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. Defining command \UndeclareSymbol with sig. 'm' on line 3314.
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. LaTeX info: "xparse/define-command"
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. Defining command \UndeclareComposite with sig. 'mm' on line 3322.
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("C:/Program Files/MiKTeX 2.9/tex/latex/fontspec/fontspec.cfg")
LaTeX Info: Redefining \itshape on input line 3507.
LaTeX Info: Redefining \slshape on input line 3512.
LaTeX Info: Redefining \scshape on input line 3517.
LaTeX Info: Redefining \upshape on input line 3522.
LaTeX Info: Redefining \em on input line 3552.
LaTeX Info: Redefining \emph on input line 3577.
(load luc: C:/Users/rmurdoch/AppData/Local/MiKTeX/2.9/luatex-cache/generic/fonts
/otl/lmroman12-bold.luc)(load luc: C:/Users/rmurdoch/AppData/Local/MiKTeX/2.9/lu
atex-cache/generic/fonts/otl/lmroman12-italic.luc)
LaTeX Info: Redefining \- on input line 3628.
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. LaTeX info: "xparse/redefine-command"
. 
. Redefining command \oldstylenums with sig. 'm' on line 3723.
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. LaTeX info: "xparse/define-command"
. 
. Defining command \liningnums with sig. 'm' on line 3727.
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))
("C:/Program Files/MiKTeX 2.9/tex/latex/hyperref/hyperref.sty"
Package: hyperref 2017/03/14 v6.85a Hypertext links for LaTeX

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Package: hobsub-hyperref 2016/05/16 v1.14 Bundle oberdiek, subset hyperref (HO)

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Package: hobsub-generic 2016/05/16 v1.14 Bundle oberdiek, subset generic (HO)
Package: hobsub 2016/05/16 v1.14 Construct package bundles (HO)
Package: infwarerr 2016/05/16 v1.4 Providing info/warning/error messages (HO)
Package: ltxcmds 2016/05/16 v1.23 LaTeX kernel commands for general use (HO)
Package: ifluatex 2016/05/16 v1.4 Provides the ifluatex switch (HO)
Package ifluatex Info: LuaTeX detected.
Package hobsub Info: Skipping package `ifvtex' (already loaded).
Package: intcalc 2016/05/16 v1.2 Expandable calculations with integers (HO)
Package hobsub Info: Skipping package `ifpdf' (already loaded).
Package: etexcmds 2016/05/16 v1.6 Avoid name clashes with e-TeX commands (HO)
Package: kvsetkeys 2016/05/16 v1.17 Key value parser (HO)
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LaTeX Info: Redefining \pageref on input line 42.
LaTeX Info: Redefining \nameref on input line 42.

(./test.out) (./test.out)
\@outlinefile=\write5

\openout5 = test.out

("C:/Program Files/MiKTeX 2.9/tex/context/base/supp-pdf.mkii"
[Loading MPS to PDF converter (version 2006.09.02).]
\scratchcounter=\count322
\scratchdimen=\dimen260
\scratchbox=\box57
\nofMPsegments=\count323
\nofMParguments=\count324
\everyMPshowfont=\toks22
\MPscratchCnt=\count325
\MPscratchDim=\dimen261
\MPnumerator=\count326
\makeMPintoPDFobject=\count327
\everyMPtoPDFconversion=\toks23
) ("C:/Program Files/MiKTeX 2.9/tex/latex/oberdiek/epstopdf-base.sty"
Package: epstopdf-base 2016/05/15 v2.6 Base part for package epstopdf

("C:/Program Files/MiKTeX 2.9/tex/latex/oberdiek/grfext.sty"
Package: grfext 2016/05/16 v1.2 Manage graphics extensions (HO)
)
Package epstopdf-base Info: Redefining graphics rule for `.eps' on input line 43
8.
Package grfext Info: Graphics extension search list:
(grfext)             [.pdf,.png,.jpg,.mps,.jpeg,.jbig2,.jb2,.PDF,.PNG,.JPG,.JPEG
,.JBIG2,.JB2 ,.eps]
(grfext)             \AppendGraphicsExtensions on input line 456.
)
! Undefined control sequence.
l.46 \commentary
              {\footnotesize{Antiphonale Romanum 1912, pg. 704}}
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.

(load luc: C:/Users/rmurdoch/AppData/Local/MiKTeX/2.9/luatex-cache/generic/fonts
/otl/lmroman10-regular.luc)
! Undefined control sequence.
l.47 \includescore
                {test_0.gtex}
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.

! Missing $ inserted.
<inserted text> 
$
l.47 \includescore{test_
                      0.gtex}
I've inserted a begin-math/end-math symbol since I think
you left one out. Proceed, with fingers crossed.

(load luc: C:/Users/rmurdoch/AppData/Local/MiKTeX/2.9/luatex-cache/generic/fonts
/otl/lmroman8-regular.luc)(load luc: C:/Users/rmurdoch/AppData/Local/MiKTeX/2.9/
luatex-cache/generic/fonts/otl/lmroman6-regular.luc)
LaTeX Font Info:    External font `cmex10' loaded for size
(Font)              <12> on input line 47.
LaTeX Font Info:    External font `cmex10' loaded for size
(Font)              <8> on input line 47.
LaTeX Font Info:    External font `cmex10' loaded for size
(Font)              <6> on input line 47.

! Extra }, or forgotten $.
l.47 \includescore{test_0.gtex}
                             
I've deleted a group-closing symbol because it seems to be
spurious, as in `$x}$'. But perhaps the } is legitimate and
you forgot something else, as in `\hbox{$x}'. In such cases
the way to recover is to insert both the forgotten and the
deleted material, e.g., by typing `I$}'.

! Missing $ inserted.
<inserted text> 
$
l.49 
   
I've inserted a begin-math/end-math symbol since I think
you left one out. Proceed, with fingers crossed.

(load luc: C:/Users/rmurdoch/AppData/Local/MiKTeX/2.9/luatex-cache/generic/fonts
/otl/lmmono12-regular.luc)(load luc: C:/Users/rmurdoch/AppData/Local/MiKTeX/2.9/
luatex-cache/generic/fonts/otl/lmmono8-regular.luc)
Package atveryend Info: Empty hook `BeforeClearDocument' on input line 54.
 [1

{C:/Users/rmurdoch/AppData/Local/MiKTeX/2.9/pdftex/config/pdftex.map}]
Package atveryend Info: Empty hook `AfterLastShipout' on input line 54.
 (./test.aux)
Package atveryend Info: Executing hook `AtVeryEndDocument' on input line 54.
Package atveryend Info: Executing hook `AtEndAfterFileList' on input line 54.
Package rerunfilecheck Info: File `test.out' has not changed.
(rerunfilecheck)             Checksum: D41D8CD98F00B204E9800998ECF8427E;0.
Package atveryend Info: Empty hook `AtVeryVeryEnd' on input line 54.
)
(\end occurred inside a group at level 1)

### simple group (level 1) entered at line 47 ({)
### bottom level

Here is how much of LuaTeX's memory you used:
 34440 strings out of 494472
 125200,794899 words of node,token memory allocated
 437 words of node memory still in use:
   4 hlist, 1 vlist, 1 rule, 4 glue, 1 glyph, 6 attribute, 51 glue_spec, 6 attri
bute_list, 1 write, 1 user_defined nodes
   avail lists: 2:96,3:19,4:10,5:26,6:106,7:56,8:8,9:21,10:4,11:6
 38147 multiletter control sequences out of 65536+200000
 44 fonts using 9655015 bytes
 39i,5n,37p,884b,366s stack positions out of 5000i,500n,10000p,200000b,50000s
<c:/program files/miktex 2.9/fonts/opentype/public/lm/lmmono8-regular.otf><c:/pr
ogram files/miktex 2.9/fonts/opentype/public/lm/lmmono12-regular.otf><c:/program
 files/miktex 2.9/fonts/opentype/public/lm/lmroman12-regular.otf><c:/program fil
es/miktex 2.9/fonts/opentype/public/lm/lmroman10-regular.otf><C:/Program Files/M
iKTeX 2.9/fonts/type1/public/amsfonts/cm/cmmi12.pfb><C:/Windows/Fonts/cmr8.pfb>
Output written on test.pdf (1 page, 30479 bytes).

PDF statistics: 49 PDF objects out of 1000 (max. 8388607)
 2 named destinations out of 1000 (max. 131072)
 1 words of extra memory for PDF output out of 10000 (max. 100000000)

[igneus]

The real issue is reported by this part of the supplied output

! Undefined control sequence.
l.46 \commentary
              {\footnotesize{Antiphonale Romanum 1912, pg. 704}}
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.

(load luc: C:/Users/rmurdoch/AppData/Local/MiKTeX/2.9/luatex-cache/generic/fonts
/otl/lmroman10-regular.luc)
! Undefined control sequence.
l.47 \includescore
                {test_0.gtex}
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.

It seems to be gregoriotex compatibility issue. No special care has been taken yet to support multiple Gregorio versions. Would you provide output of gregorio -V ?

As of now, gly should work with Gregorio 4.0, but I might add support for older versions if there was demand for it.

[BeyondTheHorizon]

I have Gregorio 5.0.1

[igneus]

Ouch, looks like I've been quite behind the current state of the art.

I don't want to make promises when a new release with support for gregorio 5 will be ready, but I'll do my best not to postpone it for too long. If you wanted to make yourself an updated version of gly in the meantime, https://github.com/igneus/gly/blob/master/lib/gly/preview_generator.rb#L69 is the method you would have to modify (replace commands \commentary and \includescore, never more supported by gregoriotex).

[BeyondTheHorizon]

Seems to work. Thanks 👍