There is a lua error after "debug.getinfo()". Why?
Thanks for help
G.Lauber
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mtx-context | run 1: luatex --fmt="/opt/context/beta-2018.09.01/tex/texmf-cache/luatex-cache/context/5fe67e0bfe781ce0dde776fb1556f32e/formats/luatex/cont-en" --jobname="texweb" --lua="/opt/context/beta-2018.09.01/tex/texmf-cache/luatex-cache/context/5fe67e0bfe781ce0dde776fb1556f32e/formats/luatex/cont-en.lui" --c:currentrun=1 --c:fulljobname="./texweb.tex" --c:input="./texweb.tex" --c:kindofrun=1 --c:maxnofruns=9 --c:texmfbinpath="/opt/context/beta-2018.09.01/tex/texmf-linux-64/bin" "cont-yes.mkiv"
This is LuaTeX, Version 1.10.1 (TeX Live 2019)
system commands enabled.
open source > level 1, order 1, name '/opt/context/beta-2018.09.01/tex/texmf-context/tex/context/base/mkiv/cont-yes.mkiv'
system >
system > ConTeXt ver: 2019.07.04 12:29 MKIV beta fmt: 2019.7.10 int: english/english
system >
system > 'cont-new.mkiv' loaded
open source > level 2, order 2, name '/opt/context/beta-2018.09.01/tex/texmf-context/tex/context/base/mkiv/cont-new.mkiv'
system > beware: some patches loaded from cont-new.mkiv
close source > level 2, order 2, name '/opt/context/beta-2018.09.01/tex/texmf-context/tex/context/base/mkiv/cont-new.mkiv'
system > files > jobname 'texweb', input './texweb', result 'texweb'
fonts > latin modern fonts are not preloaded
languages > language 'en' is active
open source > level 2, order 3, name '/tmp/uhd8RE/texweb.tex'
fonts > preloading latin modern fonts (second stage)
fonts > 'fallback modern-designsize rm 12pt' is loaded
lua error > lua error on line 6 in file /tmp/uhd8RE/texweb.tex:
[ctxlua]:1: attempt to call a nil value (field 'getinfo')
1 % generated by live script
2 \setupexternalfigures[location={local,global,default}]
3 \starttext
4 \startlua
5 debug.getinfo(2)
6 >> \stoplua
7 \stoptext
8
mtx-context | fatal error: return code: 256