早上好，当我尝试加载 siunitx 包时，TeX Studio 报告未定义的控制序列和缺少 \begin{document}。
通过编译这段代码可以复制该错误：
\documentclass[preprint, 5p]{elsarticle}
\usepackage{siunitx}
\begin{document}
Test
\end{document}
我附上了编译器生成的完整日志
This is pdfTeX, Version 3.14159265-2.6-1.40.17 (MiKTeX 2.9.6210 64-bit) (preloaded format=pdflatex 2017.4.7) 24 APR 2019 18:20
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The control sequence at the end of the top line
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! Undefined control sequence.
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l.258 }
The control sequence at the end of the top line
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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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[Loading MPS to PDF converter (version 2006.09.02).]
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) ("C:\Program Files\MiKTeX 2.9\tex\generic\oberdiek\pdftexcmds.sty"
Package: pdftexcmds 2016/05/21 v0.22 Utility functions of pdfTeX for LuaTeX (HO
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("C:\Program Files\MiKTeX 2.9\tex\generic\oberdiek\ifluatex.sty"
Package: ifluatex 2016/05/16 v1.4 Provides the ifluatex switch (HO)
Package ifluatex Info: LuaTeX not detected.
)
Package pdftexcmds Info: LuaTeX not detected.
Package pdftexcmds Info: \pdf@primitive is available.
Package pdftexcmds Info: \pdf@ifprimitive is available.
Package pdftexcmds Info: \pdfdraftmode found.
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("C:\Program Files\MiKTeX 2.9\tex\latex\oberdiek\epstopdf-base.sty"
Package: epstopdf-base 2016/05/15 v2.6 Base part for package epstopdf
("C:\Program Files\MiKTeX 2.9\tex\latex\oberdiek\grfext.sty"
Package: grfext 2016/05/16 v1.2 Manage graphics extensions (HO)
("C:\Program Files\MiKTeX 2.9\tex\generic\oberdiek\kvdefinekeys.sty"
Package: kvdefinekeys 2016/05/16 v1.4 Define keys (HO)
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Package: kvoptions 2016/05/16 v3.12 Key value format for package options (HO)
("C:\Program Files\MiKTeX 2.9\tex\generic\oberdiek\kvsetkeys.sty"
Package: kvsetkeys 2016/05/16 v1.17 Key value parser (HO)
("C:\Program Files\MiKTeX 2.9\tex\generic\oberdiek\etexcmds.sty"
Package: etexcmds 2016/05/16 v1.6 Avoid name clashes with e-TeX commands (HO)
Package etexcmds Info: Could not find \expanded.
(etexcmds) That can mean that you are not using pdfTeX 1.50 or
(etexcmds) that some package has redefined \expanded.
(etexcmds) In the latter case, load this package earlier.
)))
Package epstopdf-base Info: Redefining graphics rule for `.eps' on input line 4
38.
Package grfext Info: Graphics extension search list:
(grfext) [.png,.pdf,.jpg,.mps,.jpeg,.jbig2,.jb2,.PNG,.PDF,.JPG,.JPE
G,.JBIG2,.JB2,.eps]
(grfext) \AppendGraphicsExtensions on input line 456.
)
*geometry* driver: auto-detecting
*geometry* detected driver: pdftex
*geometry* verbose mode - [ preamble ] result:
* driver: pdftex
* paper: custom
* layout: <same size as paper>
* layoutoffset:(h,v)=(0.0pt,0.0pt)
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(C:\Users\Alessandro\AppData\Roaming\MiKTeX\2.9\tex\latex\beamer\translator\dic
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Dictionary: translator-basic-dictionary, Language: English
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(C:\Users\Alessandro\AppData\Roaming\MiKTeX\2.9\tex\latex\siunitx\siunitx-abbre
viations.cfg
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 5.
LaTeX Font Info: External font `cmex10' loaded for size
(Font) <5> on input line 5.
[1
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] (prova.aux) )
Here is how much of TeX's memory you used:
12937 strings out of 493333
269455 string characters out of 3139180
293849 words of memory out of 3000000
16401 multiletter control sequences out of 15000+200000
532371 words of font info for 30 fonts, out of 3000000 for 9000
1141 hyphenation exceptions out of 8191
40i,4n,33p,10358b,275s stack positions out of 5000i,500n,10000p,200000b,50000s
<C:/Program Files/MiKTeX 2.9/fonts/type1/public/amsfonts/cm/cmr1
0.pfb>
Output written on prova.pdf (1 page, 18166 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)
我知道类似的问题已经得到回答（siunitx 包给出未定义的控制序列) 但它似乎在 siunitx 的新版本中再次出现，而它被认为是由错误版本引起的（据称已经修复）。
非常感谢