> uplatex test.tex
This is e-upTeX, Version 3.14159265-p3.8.3-u1.26-191112-2.6 (utf8.uptex) (TeX Live 2020) (preloaded format=uplatex)
restricted \write18 enabled.
entering extended mode
(./test.tex
pLaTeX2e <2020-10-01u04>+2 (based on LaTeX2e <2020-10-01> patch level 4)
L3 programming layer <2021-02-18>
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Document Class: bxjsbook 2021/02/02 v2.5 BXJS document classes
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))) (/usr/local/texlive/2020/texmf-dist/tex/platex/pxjahyper/pxjahyper.sty
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(|extractbb --version)) (./test.aux)
*geometry* detected driver: dvipdfm
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ty)) (./test.out) (./test.out)
Package hyperref Warning: Rerun to get /PageLabels entry.
(/usr/local/texlive/2020/texmf-dist/tex/platex/pxjahyper/pxjahyper-ajm.def
! Improper \spacefactor.
\bxjs@SE ->\ifnum \spacefactor
<\@m \spacefactor \@m \else \spacefactor \sfc...
l.39 \@
gobbletwo\if\if \def\pxhy@cond#1\fi{%
? x
No pages of output.
Transcript written on test.log.
ちなみに,pxjahyper を 57732 に戻すとこのエラーは発現しませんので,今はそのように対処しています.改善のアドバイスをお願いできればありがたいです.