[Tex/LaTex] Bibliography in German

babelbibliographiesbibtexgerman

I want to change the bibliography to german. I tried to do this by adding the package \usepackage{bibgerm} and changed the \bibliographystyle{gerplain}.
But when I change these two things I get the Error:

"! Package babel Error: You haven't defined the language German yet"

Without these changes everything in the document works just fine.
Can someone help me?

\documentclass[a4paper,      % DinA4
headsepline,                 % Strich unter Kopfzeile
footsepline]{scrreprt}       % Strich über Fußzeile
\usepackage[utf8]{inputenc}  % für Umlaute
\usepackage[ngerman]{babel}  % für Silbentrennung
\usepackage{bibgerm}

\begin{document}
Test, Test \cite{Fertigungstechnik}

\bibliographystyle{gerplain}
\bibliography{literaturverzeichnis}
\end{document}

Best Answer

You very likely switched from the german to the ngerman option with babel. In that case, deleting all auxiliary files before compiling helps.

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