Missing character: There is no ; in font nullfont!

$ pdflatex example.tex 
This is pdfTeX, Version 3.141592653-2.6-1.40.24 (TeX Live 2022/Debian) (preloaded format=pdflatex)
 restricted \write18 enabled.
entering extended mode
(./example.tex
LaTeX2e <2022-06-01> patch level 5
L3 programming layer <2022-07-15>
(/usr/share/texlive/texmf-dist/tex/latex/base/article.cls
Document Class: article 2021/10/04 v1.4n Standard LaTeX document class
(/usr/share/texlive/texmf-dist/tex/latex/base/size10.clo))
(/usr/share/texlive/texmf-dist/tex/latex/pgf/frontendlayer/tikz.sty
(/usr/share/texlive/texmf-dist/tex/latex/pgf/basiclayer/pgf.sty
(/usr/share/texlive/texmf-dist/tex/latex/pgf/utilities/pgfrcs.sty
(/usr/share/texlive/texmf-dist/tex/generic/pgf/utilities/pgfutil-common.tex
(/usr/share/texlive/texmf-dist/tex/generic/pgf/utilities/pgfutil-common-lists.t
ex)) (/usr/share/texlive/texmf-dist/tex/generic/pgf/utilities/pgfutil-latex.def
) (/usr/share/texlive/texmf-dist/tex/generic/pgf/utilities/pgfrcs.code.tex
(/usr/share/texlive/texmf-dist/tex/generic/pgf/pgf.revision.tex)))
(/usr/share/texlive/texmf-dist/tex/latex/pgf/basiclayer/pgfcore.sty
(/usr/share/texlive/texmf-dist/tex/latex/graphics/graphicx.sty
(/usr/share/texlive/texmf-dist/tex/latex/graphics/keyval.sty)
(/usr/share/texlive/texmf-dist/tex/latex/graphics/graphics.sty
(/usr/share/texlive/texmf-dist/tex/latex/graphics/trig.sty)
(/usr/share/texlive/texmf-dist/tex/latex/graphics-cfg/graphics.cfg)
(/usr/share/texlive/texmf-dist/tex/latex/graphics-def/pdftex.def)))
(/usr/share/texlive/texmf-dist/tex/latex/pgf/systemlayer/pgfsys.sty
(/usr/share/texlive/texmf-dist/tex/generic/pgf/systemlayer/pgfsys.code.tex
(/usr/share/texlive/texmf-dist/tex/generic/pgf/utilities/pgfkeys.code.tex
(/usr/share/texlive/texmf-dist/tex/generic/pgf/utilities/pgfkeysfiltered.code.t
ex)) (/usr/share/texlive/texmf-dist/tex/generic/pgf/systemlayer/pgf.cfg)
(/usr/share/texlive/texmf-dist/tex/generic/pgf/systemlayer/pgfsys-pdftex.def
(/usr/share/texlive/texmf-dist/tex/generic/pgf/systemlayer/pgfsys-common-pdf.de
f)))
(/usr/share/texlive/texmf-dist/tex/generic/pgf/systemlayer/pgfsyssoftpath.code.
tex)
(/usr/share/texlive/texmf-dist/tex/generic/pgf/systemlayer/pgfsysprotocol.code.
tex)) (/usr/share/texlive/texmf-dist/tex/latex/xcolor/xcolor.sty
(/usr/share/texlive/texmf-dist/tex/latex/graphics-cfg/color.cfg)
(/usr/share/texlive/texmf-dist/tex/latex/graphics/mathcolor.ltx))
(/usr/share/texlive/texmf-dist/tex/generic/pgf/basiclayer/pgfcore.code.tex
(/usr/share/texlive/texmf-dist/tex/generic/pgf/math/pgfmath.code.tex
(/usr/share/texlive/texmf-dist/tex/generic/pgf/math/pgfmathcalc.code.tex
(/usr/share/texlive/texmf-dist/tex/generic/pgf/math/pgfmathutil.code.tex)
(/usr/share/texlive/texmf-dist/tex/generic/pgf/math/pgfmathparser.code.tex)
(/usr/share/texlive/texmf-dist/tex/generic/pgf/math/pgfmathfunctions.code.tex
(/usr/share/texlive/texmf-dist/tex/generic/pgf/math/pgfmathfunctions.basic.code
.tex)
(/usr/share/texlive/texmf-dist/tex/generic/pgf/math/pgfmathfunctions.trigonomet
ric.code.tex)
(/usr/share/texlive/texmf-dist/tex/generic/pgf/math/pgfmathfunctions.random.cod
e.tex)
(/usr/share/texlive/texmf-dist/tex/generic/pgf/math/pgfmathfunctions.comparison
.code.tex)
(/usr/share/texlive/texmf-dist/tex/generic/pgf/math/pgfmathfunctions.base.code.
tex)
(/usr/share/texlive/texmf-dist/tex/generic/pgf/math/pgfmathfunctions.round.code
.tex)
(/usr/share/texlive/texmf-dist/tex/generic/pgf/math/pgfmathfunctions.misc.code.
tex)
(/usr/share/texlive/texmf-dist/tex/generic/pgf/math/pgfmathfunctions.integerari
thmetics.code.tex)))
(/usr/share/texlive/texmf-dist/tex/generic/pgf/math/pgfmathfloat.code.tex))
(/usr/share/texlive/texmf-dist/tex/generic/pgf/math/pgfint.code.tex)
(/usr/share/texlive/texmf-dist/tex/generic/pgf/basiclayer/pgfcorepoints.code.te
x)
(/usr/share/texlive/texmf-dist/tex/generic/pgf/basiclayer/pgfcorepathconstruct.
code.tex)
(/usr/share/texlive/texmf-dist/tex/generic/pgf/basiclayer/pgfcorepathusage.code
.tex)
(/usr/share/texlive/texmf-dist/tex/generic/pgf/basiclayer/pgfcorescopes.code.te
x)
(/usr/share/texlive/texmf-dist/tex/generic/pgf/basiclayer/pgfcoregraphicstate.c
ode.tex)
(/usr/share/texlive/texmf-dist/tex/generic/pgf/basiclayer/pgfcoretransformation
s.code.tex)
(/usr/share/texlive/texmf-dist/tex/generic/pgf/basiclayer/pgfcorequick.code.tex
)
(/usr/share/texlive/texmf-dist/tex/generic/pgf/basiclayer/pgfcoreobjects.code.t
ex)
(/usr/share/texlive/texmf-dist/tex/generic/pgf/basiclayer/pgfcorepathprocessing
.code.tex)
(/usr/share/texlive/texmf-dist/tex/generic/pgf/basiclayer/pgfcorearrows.code.te
x)
(/usr/share/texlive/texmf-dist/tex/generic/pgf/basiclayer/pgfcoreshade.code.tex
)
(/usr/share/texlive/texmf-dist/tex/generic/pgf/basiclayer/pgfcoreimage.code.tex

(/usr/share/texlive/texmf-dist/tex/generic/pgf/basiclayer/pgfcoreexternal.code.
tex))
(/usr/share/texlive/texmf-dist/tex/generic/pgf/basiclayer/pgfcorelayers.code.te
x)
(/usr/share/texlive/texmf-dist/tex/generic/pgf/basiclayer/pgfcoretransparency.c
ode.tex)
(/usr/share/texlive/texmf-dist/tex/generic/pgf/basiclayer/pgfcorepatterns.code.
tex)
(/usr/share/texlive/texmf-dist/tex/generic/pgf/basiclayer/pgfcorerdf.code.tex))
)
(/usr/share/texlive/texmf-dist/tex/generic/pgf/modules/pgfmoduleshapes.code.tex
) (/usr/share/texlive/texmf-dist/tex/generic/pgf/modules/pgfmoduleplot.code.tex
)
(/usr/share/texlive/texmf-dist/tex/latex/pgf/compatibility/pgfcomp-version-0-65
.sty)
(/usr/share/texlive/texmf-dist/tex/latex/pgf/compatibility/pgfcomp-version-1-18
.sty)) (/usr/share/texlive/texmf-dist/tex/latex/pgf/utilities/pgffor.sty
(/usr/share/texlive/texmf-dist/tex/latex/pgf/utilities/pgfkeys.sty
(/usr/share/texlive/texmf-dist/tex/generic/pgf/utilities/pgfkeys.code.tex))
(/usr/share/texlive/texmf-dist/tex/latex/pgf/math/pgfmath.sty
(/usr/share/texlive/texmf-dist/tex/generic/pgf/math/pgfmath.code.tex))
(/usr/share/texlive/texmf-dist/tex/generic/pgf/utilities/pgffor.code.tex
(/usr/share/texlive/texmf-dist/tex/generic/pgf/math/pgfmath.code.tex)))
(/usr/share/texlive/texmf-dist/tex/generic/pgf/frontendlayer/tikz/tikz.code.tex

(/usr/share/texlive/texmf-dist/tex/generic/pgf/libraries/pgflibraryplothandlers
.code.tex)
(/usr/share/texlive/texmf-dist/tex/generic/pgf/modules/pgfmodulematrix.code.tex
)
(/usr/share/texlive/texmf-dist/tex/generic/pgf/frontendlayer/tikz/libraries/tik
zlibrarytopaths.code.tex)))
(/usr/share/texlive/texmf-dist/tex/latex/tikz-bayesnet/tikzlibrarybayesnet.code
.tex
(/usr/share/texlive/texmf-dist/tex/generic/pgf/frontendlayer/tikz/libraries/tik
zlibraryshapes.code.tex
(/usr/share/texlive/texmf-dist/tex/generic/pgf/frontendlayer/tikz/libraries/tik
zlibraryshapes.geometric.code.tex
(/usr/share/texlive/texmf-dist/tex/generic/pgf/libraries/shapes/pgflibraryshape
s.geometric.code.tex))
(/usr/share/texlive/texmf-dist/tex/generic/pgf/frontendlayer/tikz/libraries/tik
zlibraryshapes.misc.code.tex
(/usr/share/texlive/texmf-dist/tex/generic/pgf/libraries/shapes/pgflibraryshape
s.misc.code.tex))
(/usr/share/texlive/texmf-dist/tex/generic/pgf/frontendlayer/tikz/libraries/tik
zlibraryshapes.symbols.code.tex
(/usr/share/texlive/texmf-dist/tex/generic/pgf/libraries/shapes/pgflibraryshape
s.symbols.code.tex))
(/usr/share/texlive/texmf-dist/tex/generic/pgf/frontendlayer/tikz/libraries/tik
zlibraryshapes.arrows.code.tex
(/usr/share/texlive/texmf-dist/tex/generic/pgf/libraries/shapes/pgflibraryshape
s.arrows.code.tex))
(/usr/share/texlive/texmf-dist/tex/generic/pgf/frontendlayer/tikz/libraries/tik
zlibraryshapes.callouts.code.tex
(/usr/share/texlive/texmf-dist/tex/generic/pgf/libraries/shapes/pgflibraryshape
s.callouts.code.tex))
(/usr/share/texlive/texmf-dist/tex/generic/pgf/frontendlayer/tikz/libraries/tik
zlibraryshapes.multipart.code.tex
(/usr/share/texlive/texmf-dist/tex/generic/pgf/libraries/shapes/pgflibraryshape
s.multipart.code.tex)))
(/usr/share/texlive/texmf-dist/tex/generic/pgf/frontendlayer/tikz/libraries/tik
zlibraryfit.code.tex)
(/usr/share/texlive/texmf-dist/tex/generic/pgf/frontendlayer/tikz/libraries/tik
zlibrarychains.code.tex
(/usr/share/texlive/texmf-dist/tex/generic/pgf/frontendlayer/tikz/libraries/tik
zlibrarypositioning.code.tex))
(/usr/share/texlive/texmf-dist/tex/generic/pgf/frontendlayer/tikz/libraries/tik
zlibraryarrows.code.tex
(/usr/share/texlive/texmf-dist/tex/generic/pgf/libraries/pgflibraryarrows.code.
tex))) (/usr/share/texlive/texmf-dist/tex/latex/l3backend/l3backend-pdftex.def)
 (./example.aux)
(/usr/share/texlive/texmf-dist/tex/context/base/mkii/supp-pdf.mkii
[Loading MPS to PDF converter (version 2006.09.02).]
) (/usr/share/texlive/texmf-dist/tex/latex/epstopdf-pkg/epstopdf-base.sty
(/usr/share/texlive/texmf-dist/tex/latex/latexconfig/epstopdf-sys.cfg))

LaTeX Font Warning: Font shape `OMS/cmtt/m/n' undefined
(Font)              using `OMS/cmsy/m/n' instead
(Font)              for symbol `textbackslash' on input line 38.

Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
(./model_pca.tex
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
) (./model_pca2.tex
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
) (./model_lda.tex
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
) (./model_citation_influence.tex
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
Missing character: There is no ; in font nullfont!
) [1{/var/lib/texmf/fonts/map/pdftex/updmap/pdftex.map}] [2] [3] [4]
(./example.aux)

LaTeX Font Warning: Some font shapes were not available, defaults substituted.

 )</usr/share/texlive/texmf-dist/fonts/type1/public/amsfonts/cm/cmbx10.pfb></us
r/share/texlive/texmf-dist/fonts/type1/public/amsfonts/cm/cmbx12.pfb></usr/shar
e/texlive/texmf-dist/fonts/type1/public/amsfonts/cm/cmmi10.pfb></usr/share/texl
ive/texmf-dist/fonts/type1/public/amsfonts/cm/cmmi5.pfb></usr/share/texlive/tex
mf-dist/fonts/type1/public/amsfonts/cm/cmmi6.pfb></usr/share/texlive/texmf-dist
/fonts/type1/public/amsfonts/cm/cmmi7.pfb></usr/share/texlive/texmf-dist/fonts/
type1/public/amsfonts/cm/cmmi8.pfb></usr/share/texlive/texmf-dist/fonts/type1/p
ublic/amsfonts/cm/cmr10.pfb></usr/share/texlive/texmf-dist/fonts/type1/public/a
msfonts/cm/cmr12.pfb></usr/share/texlive/texmf-dist/fonts/type1/public/amsfonts
/cm/cmr17.pfb></usr/share/texlive/texmf-dist/fonts/type1/public/amsfonts/cm/cmr
8.pfb></usr/share/texlive/texmf-dist/fonts/type1/public/amsfonts/cm/cmsy10.pfb>
</usr/share/texlive/texmf-dist/fonts/type1/public/amsfonts/cm/cmsy6.pfb></usr/s
hare/texlive/texmf-dist/fonts/type1/public/amsfonts/cm/cmsy7.pfb></usr/share/te
xlive/texmf-dist/fonts/type1/public/amsfonts/cm/cmsy8.pfb></usr/share/texlive/t
exmf-dist/fonts/type1/public/amsfonts/cm/cmti10.pfb></usr/share/texlive/texmf-d
ist/fonts/type1/public/amsfonts/cm/cmtt10.pfb>
Output written on example.pdf (4 pages, 192757 bytes).
Transcript written on example.log.