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I use BibLaTeX to format my professional CV, with several, separate, "refsections" citing my publications. I recently moved into a new computer and noticed after installing the latest version of MikTeX (v23.10), there appears to be an unfortunate conflict between biblatex (2023/03/05 v3.19) and babel (2023/09/29 v3.95) that results in the following error:

! Missing \endcsname inserted.
<to be read again> 
                   \relax 
l.25 \end
         {refsection}

Here is a MWE that illustrates the issue:

\documentclass{article}

\usepackage[american]{babel}
\usepackage[style=apa6,sorting=ydnt,backend=biber]{biblatex}
\DeclareLanguageMapping{american}{american-apa}
\addbibresource{\jobname.bib}


\begin{filecontents}{\jobname.bib}
@book{key,
  author = {Author, A.},
  year = {2001},
  title = {This is a Title},
  publisher = {Publisher},
}
\end{filecontents}


\begin{document}


\section{Scholarship}


\begin{refsection}
\nocite{key}
\printbibliography
\end{refsection}


\end{document}
Brian
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    in a currently system you don't need \DeclareLanguageMapping (see e.g. https://tex.stackexchange.com/a/474640/2388) and if I remove it your document compiles. – Ulrike Fischer Jan 25 '24 at 18:19
  • How about that! When I remove the \DeclareLanguageMapping command from my much-more-complex document it also compiles without complaint. Thank you very much @UlrikeFischer! – Brian Jan 25 '24 at 18:49
  • Often the explicit \DeclareLanguageMapping with biblatex-apa/biblatex-apa6, while unnecessary, is not actively harmful. Here it is harmful, because \DeclareLanguageMapping{american}{american-apa} loads biblatex-apa's .lbx files, but you are using biblatex-apa6 so this code forces biblatex to load the incorrect localisation files for your style leading to resulting in low-level errors. – moewe Jan 26 '24 at 07:15

1 Answers1

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In a currently system you don't need \DeclareLanguageMapping (see e.g. https://tex.stackexchange.com/a/474640/2388 for more details) and if I remove it your document compiles.

Ulrike Fischer
  • 327,261