! Extra \endgroup error

Question

After compiling my latex file using MikTek in Windows 10 using TexMaker, I get the following error.

! Extra \endgroup.
\document ->\endgroup
\let \BeforeStartOfDocument \@firstofone \cpt@beforest...
l.73 \begin{document}

The .pdf file is getting generated but cannot be seen in the built-in viewer of TexMaker. What should I be rectifying in my latex file?

You are using a package that uses catoptions, which doesn't work. Please show a compilable example that demonstrates the issue — Phelype Oleinik, Feb 4, 2021 at 10:19
Either something in your preamble is incompatible with a current latex, or something is not up-to-date. But without a small but complete example it is not possible to say more. — Ulrike Fischer, Feb 4, 2021 at 10:20
Unfortunately, catoptions is broken with the current LaTeX kernel: it uses several tricks that heavily modify the standard behavior of LaTeX, so the fact it eventually broke was not unexpected. — egreg, Feb 4, 2021 at 10:40

Subhadip Roy · Accepted Answer · 2021-02-04 17:33:42Z

22

A quick fix is to use \RequirePackage[2020-02-02]{latexrelease} before \documentclass[]{}.

answered Feb 4, 2021 at 17:33

Subhadip Roy

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This fixed it for me, MikTek with TexStudio on Windows. I tried the latest RevTex on MikTek, and I tried downloading directly from CTAN. Nothing worked except this.
– Matt Stein
Jan 20, 2022 at 17:11
1

This works on overleaf when compiling COLI templates.
– Vimos
Feb 18, 2022 at 1:48
1

This worked for me with rQUF2e document class
– zer0hedge
Mar 16, 2022 at 9:01
1

This introduces the hyperref bug with pageref as described here. In my case, OP's error was being caused by the inclusion of the xwatermark package (\usepackage[printwatermark]{xwatermark}). Will not be using it, then.
– Mew
Apr 28 at 14:30

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