今天更新我的 MiKTeX 2.9 后，如果加载了 siunitx，所有文档在编译时都会崩溃，并出现错误！未定义的控制序列。...
\documentclass{article}
% RN. 10 July 2018
% BRIEF DESCRIPTION:
% After updating my MiKTeX 2.9 today all my documents crash, if siunitx is loaded, with
% ERROR ! Undefined control equence.<argument>
% \seq_const_from_clist:Nn\c__siunitx_old_options_seq {addsign,all... }
%=======================
%\usepackage{siunitx}
%-----------------------
\begin{document}
Hi there!
\end{document}
日志文件：
This is pdfTeX, Version 3.14159265-2.6-1.40.18 (MiKTeX 2.9.6400 64-bit) (preloaded format=pdflatex 2018.7.10) 11 JUL 2018 17:35
entering extended mode
**./MWE_Template.tex
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Babel <3.14> and hyphenation patterns for 75 language(s) loaded.
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Package: siunitx 2018/05/17 v2.7s A comprehensive (SI) units package
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! Undefined control sequence.
<argument> \seq_const_from_clist:Nn
\c__siunitx_old_options_seq {addsign,all...
l.258 }
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.
! Undefined control sequence.
<argument> ...list:Nn \c__siunitx_old_options_seq
{addsign,allowlitunits,all...
l.258 }
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.
! LaTeX Error: Missing \begin{document}.
See the LaTeX manual or LaTeX Companion for explanation.
Type H <return> for immediate help.
...
l.258 }
You're in trouble here. Try typing <return> to proceed.
If that doesn't work, type X <return> to quit.
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. LaTeX info: "xparse/define-command"
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. Defining command \DeclareBinaryPrefix with sig. 'mmm' on line 7237.
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. Defining command \DeclareSIPrefix with sig. 'mmm' on line 7243.
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. Defining command \DeclareSIPrePower with sig. 'mm' on line 7246.
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. Defining command \DeclareSIQualifier with sig. 'mm' on line 7249.
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. Defining command \DeclareSIUnit with sig. 'O{}mm' on line 7252.
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. Defining command \DeclareSIUnitWithOptions with sig. 'mmm' on line 7255.
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. Defining command \ang with sig. 'o>{\SplitArgument {2}{;}}m' on line 7270.
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. Defining command \SIlist with sig. 'o>{\SplitList {;}}mm' on line 7309.
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. Defining command \SIrange with sig. 'ommm' on line 7321.
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. Defining command \SI with sig. 'omom' on line 7333.
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. Defining command \sisetup with sig. 'm' on line 7336.
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. Defining command \tablenum with sig. 'om' on line 7351.
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. Defining command \si with sig. 'om' on line 7363.
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. Defining command \numInBookmark with sig. 'om' on line 7410.
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. Defining command \numrangeInBookmark with sig. 'omm' on line 7412.
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. Defining command \SIInBookmark with sig. 'omom' on line 7414.
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. LaTeX info: "xparse/define-command"
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. Defining command \SIlistInBookmark with sig. 'omm' on line 7416.
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. Defining command \SIrangeInBookmark with sig. 'ommm' on line 7418.
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)
Overfull \hbox (6018.29338pt too wide) in paragraph at lines 258--11
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Underfull \hbox (badness 10000) in paragraph at lines 258--11
[]
(MWE_Template.aux)
\openout1 = `MWE_Template.aux'.
LaTeX Font Info: Checking defaults for OML/cmm/m/it on input line 13.
LaTeX Font Info: ... okay on input line 13.
LaTeX Font Info: Checking defaults for T1/cmr/m/n on input line 13.
LaTeX Font Info: ... okay on input line 13.
LaTeX Font Info: Checking defaults for OT1/cmr/m/n on input line 13.
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LaTeX Font Info: Checking defaults for OMS/cmsy/m/n on input line 13.
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LaTeX Font Info: Checking defaults for OMX/cmex/m/n on input line 13.
LaTeX Font Info: ... okay on input line 13.
LaTeX Font Info: Checking defaults for U/cmr/m/n on input line 13.
LaTeX Font Info: ... okay on input line 13.
("C:\Users\Reinhard Neuwirth\AppData\Roaming\MiKTeX\2.9\tex\latex\siunitx\siuni
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File: siunitx-abbreviations.cfg 2017/11/26 v2.7k siunitx: Abbreviated units
)
LaTeX Font Info: External font `cmex10' loaded for size
(Font) <7> on input line 13.
LaTeX Font Info: External font `cmex10' loaded for size
(Font) <5> on input line 13.
[1
{C:/Users/Reinhard Neuwirth/AppData/Local/MiKTeX/2.9/pdftex/config/pdftex.map}]
(MWE_Template.aux) )
Here is how much of TeX's memory you used:
10425 strings out of 493318
232869 string characters out of 3138960
241354 words of memory out of 3000000
14010 multiletter control sequences out of 15000+200000
531681 words of font info for 28 fonts, out of 3000000 for 9000
1141 hyphenation exceptions out of 8191
32i,4n,33p,10365b,275s stack positions out of 5000i,500n,10000p,200000b,50000s
<C:/Program Files/MiKTeX 2.9/fonts/type1/public/amsfonts/c
m/cmr10.pfb>
Output written on MWE_Template.pdf (1 page, 18428 bytes).
PDF statistics:
10 PDF objects out of 1000 (max. 8388607)
0 named destinations out of 1000 (max. 500000)
1 words of extra memory for PDF output out of 10000 (max. 10000000)
答案1
查看日志文件中的内容
("C:\Users\Reinhard Neuwirth\AppData\Roaming\MiKTeX\2.9\tex\latex\siunitx\siuni
tx.sty" ("C:\Program Files\MiKTeX 2.9\tex\latex\l3kernel\expl3.sty"
Package: expl3 2017/09/18 L3 programming layer (loader)
再往前走一点你会发现
Package: siunitx 2018/05/17 v2.7s A comprehensive (SI) units package
并且版本不匹配。问题似乎在于您是siunitx在“用户”模式而不是“管理员”模式下更新的，并且确实siunitx是从用户路径下的目录加载的。
始终以“管理员”模式更新并执行满的更新。
问题是已于\seq_const_from_clist:Nn2017-11-28 引入，但您使用的版本expl3早于此。