我目前正在撰写一篇研究论文，并使用其他学生制作的模板。
当我使用命令打印参考书目时
\printbibliography[nottype=online,heading=bibintoc,title={\langde{Literaturverzeichnis}\langen{Bibliography}}]
，编译器给出了以下错误：
\langen和\langde是两个指定在英语和德语之间切换的命令，当前执行的是德语命令（并且在每一个它的其他用法。但是，当我完全删除那里的命令时，仍然会收到错误。
我该如何解决这个问题？
这应该是 main.tex 文件的最小版本。
\documentclass[12pt,oneside,titlepage,listof=totoc,bibliography=totoc]{scrartcl}
\newif\ifde
\newif\ifen
\input{src/skripte/meta}
\newcommand{\langde}[1]{%
\ifde\selectlanguage{ngerman}#1\fi}
\newcommand{\langen}[1]{%
\ifen\selectlanguage{english}#1\fi}
\selectlanguage{ngerman}
\usepackage[utf8]{luainputenc}
\usepackage[babel,german=quotes]{csquotes}
\usepackage{fancyhdr}
\usepackage{fancybox}
\usepackage[a4paper, left=4cm, right=2cm, top=4cm, bottom=2cm]{geometry}
\usepackage{graphicx}
\usepackage{colortbl}
\usepackage[capposition=bottom]{floatrow}
\usepackage{array}
\usepackage{float}
\usepackage{footnote}
\usepackage{url}
\urlstyle{same}
\usepackage[
backend=biber,
style=ext-authoryear-ibid, maxcitenames=3, maxbibnames=999,
mergedate=false,
date=iso,
seconds=true, urldate=iso,
innamebeforetitle,
dashed=false,
autocite=footnote,
doi=false,
useprefix=true, mincrossrefs = 1
]{biblatex}
\input{src/skripte/modsBiblatex2018}
\addbibresource{src/literatur/literatur.bib}
\AtBeginBibliography{\singlespacing}
\begin{document}
\nocite{*}
\printbibliography
\end{document}
这是由 LuaLatex 创建的日志文件。
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system commands enabled.
**/data/thesis_main.tex
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. L3 programming layer <2020-02-14>
(/usr/share/texlive/texmf-dist/tex/latex/koma-script/scrartcl.cls
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Package biblatex Info: Trying to load bibliographic data...
Package biblatex Info: ... file 'thesis_main.bbl' found.
(./thesis_main.bbl
! Extra }, or forgotten \endgroup.
l.27 }
?
! Emergency stop.
l.27 }
End of file on the terminal!