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I tried to compile a (flawlessly working) LaTeX document on a different computer, and suddenly was faced with the above error message printed by the xparse package (after that, many errors follow).

I'm working on both computers with miktex 2.9 (and Texnic-Center) on Windows 7 (64 bit).

I tried EVERYTHING I found on stackexchange or anywhere else on the web, including:

  • Updating all packages
  • Removing the l3 packages and reinstalling them
  • Doing the above for both the current user and in admin mode
  • Removing the complete miktex distribution and re-installing it
    • for only the current user
    • for "anyone who uses this computer"
    • with all packages
    • only the basic packages
  • Downloading the newest l3 packages manually from CTAN and copying them into the miktex folder
  • Refreshing the FNDB and updating formats afterwards

Nothing worked. Right now, I'm just out of ideas. ANY suggestions??

EDIT: After performing UlrikeFischer's suggestion, I get different errors. After a long compilation process, this is the log file I get:

Log File

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    Related: tex.stackexchange.com/questions/301707/…
    – Steven B. Segletes
    Mar 31, 2016 at 10:24
  • Okay, this is an EXTREMELY recent post I missed :-) But I actually tried even that before, and it didn't work...
    – lukas.coenig
    Mar 31, 2016 at 10:27
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    The problem will be sorted out probably in a few hours, Christian Schenk already anounced the update. In the meantime get the l3kernel.tds.zip from CTAN (ctan.org/pkg/l3kernel, SVN 6468 (!!)), unpack it outside miktex, and add the root folder with miktex settings (user, not admin) as a new root.
    – Ulrike Fischer
    Mar 31, 2016 at 10:29
  • @UlrikeFischer: Is there a way to know when the fixed update will be available? Because your suggestion does seem to work, but I have still some strange errors, and I'm not sure if they're related to the bug or not...
    – lukas.coenig
    Mar 31, 2016 at 12:37
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    You are loading pstricks but compile with pdflatex. This can't work (and never did). The other error message (from xcolor) is a follow-up error.
    – Ulrike Fischer
    Mar 31, 2016 at 14:37

2 Answers 2

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I also encountered this problem after updating my MiKTeX installation today. A different question thread (https://tex.stackexchange.com/a/301738) provided a quick temporary work-around. For minimal example

\documentclass{article}
\usepackage{fontspec}
\begin{document}
Testing:\[1,2,3\]
\end{document}

Changing lines 53 and 54 in MikTeX installation directory/tex/latex/l3packages/xparse/xparse.sty to

\RequirePackage{expl3}[2016/03/26]
\@ifpackagelater{expl3}{2016/03/26}

Allows xelatex to compile the provided example.

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  • Unfortunatelly, with plain pdflatex this did not work for me, and I can't use xelatex.
    – lukas.coenig
    Mar 31, 2016 at 13:42
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    @lukas.coenig the fix is unrelated to xelatex/pdflatex and will work for either, perhaps you are getting the same error with a different package (eg xfrac) the same issue applies to all of them. But anyway a fix is already on ctan and will be in texlive/miktex as soon as possible.
    – David Carlisle
    Mar 31, 2016 at 14:12
  • Okay, great, I'll wait for it then! Thanks!
    – lukas.coenig
    Mar 31, 2016 at 14:13
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in TeX Live Utility find the update for l3kernel and install it. In Unix/Mac systems try: {tlmgr update l3kernel}

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