BibTeX, biblatex and biber ⇒ biblatex-apa and \printbibliography

[python]

Hi,

I use biblatex-apa to get APA-compliant citations.

But whenever the compiler calls \printbibliography, I get the following error message:

Code: Select all

! Argument of " has an extra }.
<inserted text> 
                \par 
l.136 \end
          {document}
? 

This doesn't happen if I switch to different biblatex styles. Then it works.


The surrounding code snippet is:

Code: Select all

% previous code
cited \citet{Author} cited


\printbibliography
\end{document}

The document header is as follows:

Code: Select all

\usepackage[ngerman]{babel}
\usepackage[margin=10pt,font=small,labelfont=bf,labelsep=quad,justification=raggedright,singlelinecheck=false]{caption}
\usepackage{csquotes}
\usepackage[style=apa]{biblatex}
\DeclareLanguageMapping{ngerman}{ngerman-apa}
%\usepackage[style=authoryear,natbib=true]{biblatex}
\bibliography{/path/to/literature}
\def\citet{\textcite}
\def\citep{\parencite}
\def\citealp{\nptextcite}

If I comment \printbibliography, the file compiles.

I have absolutely no idea what is going wrong...

Please help...

Greetings
Chris