# German umlaut in the language-field in the bibliography

If I place a german umlaut like e.g. "ü" in the language-field of a biber entry, and if I then run biber & pdflatex the way I usually do, I get the following error:

Missing \endcsname inserted


There's no difference whether I input a plain "ü" or I use \"{u} or {\"u}. Also, changing the entry-type doesn't change things.

The interesting thing about this behaviour: placing an "ü" into one of the more common fields (like author for example) doesn't produce any error at all and works fine with many entrys for me.

I'd like to have the word "Frühneuhochdeutsch" in the language-field; any suggestions?

MWE:

The bibliography:

@Misc{Habsburg95DieHandhabungdesa,
Title                    = {Handhabung},
Author                   = {Maximilian I. von Habsburg},
Language                 = {Frühneuhochdeutsch},
Month                    = {aug},
Year                     = {1495},

Timestamp                = {2014-01-19}
}


The document:

\documentclass[a4paper,10pt,twoside]{article}
\usepackage[utf8]{inputenc}
\usepackage[ngerman]{babel}
\usepackage[babel,german=guillemets]{csquotes}
\usepackage[
backend=biber,
style=alphabetic,
natbib=true,
]{biblatex}
\usepackage{lipsum}

\begin{document}

\lipsum[1] \cite{Habsburg95DieHandhabungdesa}

\newpage

\printbibliography

\end{document}

• Please add a minimal working example (MWE) that illustrates your problem. It will be much easier for us to reproduce your situation and find out what the issue is when we see compilable code, starting with \documentclass{...} and ending with \end{document}. – Benedikt Bauer Jan 19 '14 at 21:24
• Do you have the file encoded to UTF8? How are you running biber on the file (what options)? – Werner Jan 20 '14 at 7:06
• it must e one of the supported languages. See table 4 in the biblatex documentation. – user2478 Jan 20 '14 at 7:30
• @Werner well, places other than the regular document (see MWE) where options can be made? – user43961 Jan 20 '14 at 9:13
• biber is only for sorting. The main package is biblatex you have to use a custom field if you want to use it for your own language setting. – user2478 Jan 20 '14 at 9:15

use language=auto or one of the predefined languages in table 4 of the biblatex documentation.