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I have installed and deleted the package several times with Miktek. I am writing in TexMaker editor for Windows. Also it does not work for WinEdt. The code is.

\documentclass[article]
\usepackage{expl3}
\begin{document}
111
\end{document}

The complete error reads

! Missing = inserted for \ifnum.
to be read again

l.283 }
I was expecting to see `<', `=', or `>'. Didn't.
)
! Missing = inserted for \ifnum.
to be read again

Thanks in advance

Joseph Wright
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Zäp Äta
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    Is your entire LaTeX installation up to date? That error is common if expl3 is new, but your version of the LaTeX kernel is old. See also https://tex.stackexchange.com/q/422176/35864. Run an update in both admin and user mode at least twice. See https://tex.stackexchange.com/q/55437/35864 and https://tex.stackexchange.com/q/108447/35864. – moewe Jan 21 '19 at 06:56
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    \documentclass[article] is wrong, please use \documentclass{article} –  Jan 21 '19 at 08:24
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    The syntax error in the question won't give that particular error message ... – Joseph Wright Jan 21 '19 at 08:32
  • @moewe Do you think we should mark as a dupe here? – Joseph Wright Jan 21 '19 at 08:32
  • @JosephWright For all I know it is a duplicate. But maybe it is a bit safer to wait for feedback from the OP before closing. – moewe Jan 21 '19 at 08:41
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    The update solved the problem. Thank you very much. – Zäp Äta Jan 21 '19 at 21:01
  • I voted to close the question as a duplicate of the question indicated in the first comment, since the OP confirmed that this solved the issue. – moewe Jan 21 '19 at 21:16

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