LaTeX error listings on Docker

error.log

This is XeTeX, Version 3.14159265-2.6-0.99992 (TeX Live 2015/dev/Debian) (preloaded format=xelatex 2019.8.11)  11 AUG 2019 10:38
entering extended mode
 restricted \write18 enabled.
 %&-line parsing enabled.
**refcard.tex
(./refcard.tex
LaTeX2e <2014/05/01>
Babel <3.9l> and hyphenation patterns for 79 languages loaded.
(/usr/share/texlive/texmf-dist/tex/latex/base/article.cls
Document Class: article 2014/09/29 v1.4h Standard LaTeX document class
(/usr/share/texlive/texmf-dist/tex/latex/base/size10.clo
File: size10.clo 2014/09/29 v1.4h Standard LaTeX file (size option)
)
\c@part=\count80
\c@section=\count81
\c@subsection=\count82
\c@subsubsection=\count83
\c@paragraph=\count84
\c@subparagraph=\count85
\c@figure=\count86
\c@table=\count87
\abovecaptionskip=\skip41
\belowcaptionskip=\skip42
\bibindent=\dimen102
)
(/usr/share/texlive/texmf-dist/tex/latex/tools/tabularx.sty
Package: tabularx 2014/10/28 v2.10 `tabularx' package (DPC)

(/usr/share/texlive/texmf-dist/tex/latex/tools/array.sty
Package: array 2014/10/28 v2.4c Tabular extension package (FMi)
\col@sep=\dimen103
\extrarowheight=\dimen104
\NC@list=\toks14
\extratabsurround=\skip43
\backup@length=\skip44
)
\TX@col@width=\dimen105
\TX@old@table=\dimen106
\TX@old@col=\dimen107
\TX@target=\dimen108
\TX@delta=\dimen109
\TX@cols=\count88
\TX@ftn=\toks15
)
(/usr/share/texlive/texmf-dist/tex/latex/listings/listings.sty
(/usr/share/texlive/texmf-dist/tex/latex/graphics/keyval.sty
Package: keyval 2014/05/08 v1.15 key=value parser (DPC)
\KV@toks@=\toks16
)
\lst@mode=\count89
\lst@gtempboxa=\box26
\lst@token=\toks17
\lst@length=\count90
\lst@currlwidth=\dimen110
\lst@column=\count91
\lst@pos=\count92
\lst@lostspace=\dimen111
\lst@width=\dimen112
\lst@newlines=\count93
\lst@lineno=\count94
\lst@maxwidth=\dimen113

(/usr/share/texlive/texmf-dist/tex/latex/listings/lstmisc.sty
File: lstmisc.sty 2014/09/06 1.5e (Carsten Heinz)
\c@lstnumber=\count95
\lst@skipnumbers=\count96
\lst@framebox=\box27
)
(/usr/share/texlive/texmf-dist/tex/latex/listings/listings.cfg
File: listings.cfg 2014/09/06 1.5e listings configuration
))
Package: listings 2014/09/06 1.5e (Carsten Heinz)
 (./refcard.aux)
\openout1 = `refcard.aux'.

LaTeX Font Info:    Checking defaults for OML/cmm/m/it on input line 5.
LaTeX Font Info:    ... okay on input line 5.
LaTeX Font Info:    Checking defaults for T1/cmr/m/n on input line 5.
LaTeX Font Info:    ... okay on input line 5.
LaTeX Font Info:    Checking defaults for OT1/cmr/m/n on input line 5.
LaTeX Font Info:    ... okay on input line 5.
LaTeX Font Info:    Checking defaults for OMS/cmsy/m/n on input line 5.
LaTeX Font Info:    ... okay on input line 5.
LaTeX Font Info:    Checking defaults for OMX/cmex/m/n on input line 5.
LaTeX Font Info:    ... okay on input line 5.
LaTeX Font Info:    Checking defaults for U/cmr/m/n on input line 5.
LaTeX Font Info:    ... okay on input line 5.
\c@lstlisting=\count97

! Missing { inserted.
<inserted text> 
                {
l.8 \end{tabularx}
                  
? x
 
Here is how much of TeX's memory you used:
 1505 strings out of 493727
 21079 string characters out of 6147890
 74471 words of memory out of 5000000
 4900 multiletter control sequences out of 15000+600000
 3640 words of font info for 14 fonts, out of 8000000 for 9000
 1328 hyphenation exceptions out of 8191
 26i,12n,32p,154b,984s stack positions out of 5000i,500n,10000p,200000b,80000s
No pages of output.