! Package keyval Error: langjapanese undefined

Question

I'm completely new to LaTeX. I'm using MiKTeX 2.9 (r.c29723a). When I launch TeXworks and try to compile https://github.com/AndreyAkinshin/Russian-Phd-LaTeX-Dissertation-Template/blob/master/Dissertation/dissertation.tex, I receive the following error:

...
(C:\Tools\MiKTeX\tex\latex\biblatex\lbx\russian.lbx
! Package keyval Error: langjapanese undefined.

By clicking on the error message I jump to the closing brace of "\DeclareBibliographyStrings{%" in "russian.lbx", but this "key-value table" does have a "langjapanese" entry in it:

langjapanese   = {{японский}{яп\adddot}},

Am I missing something obvious here?

Answer 1

This problem has been resolved in biblatex 3.2.

---

This is a tiny bug (more of a buglet, really) in the current release of biblatex. As far as I can tell it only occurs with russian.lbx because two new strings were added, but it was neglected to declare said strings beforehand. The bug has been fixed in 9ff117c and cc2c322, the update, however, has not yet made it to CTAN I believe. A pre-release version with the fix is already available on sourceforge.

Until the fixed version is uploaded

\NewBibliographyString{langjapanese}
\NewBibliographyString{fromjapanese}

should suffice as work-around.

The following MWE

\documentclass[russian]{article}
\usepackage[utf8]{inputenc}
\usepackage{babel}
\usepackage{csquotes}
\usepackage{biblatex}
\addbibresource{biblatex-examples.bib}

\NewBibliographyString{langjapanese}
\NewBibliographyString{fromjapanese}
\begin{document}
\cite[9]{sigfridsson}
\printbibliography
\end{document}

runs just fine