# Undefined control sequence due to \printbibliography [closed]

I am currently writing my master's thesis using TeX Live and Texmaker and have suddenly run into an "undefined control sequence" that points to the line

\printbibliography[heading=bibintoc,title={References}]


in my preamble. However, this error only surfaces on the second run of pdflatex when all .aux-files etc. are deleted in the respective folder. With pre-existing files, this happens already on the first run.

My current preamble (shortened):

\documentclass{report}
\usepackage[utf8]{inputenc}
\usepackage[british]{babel}
\usepackage[backend=biber,style=apa,citestyle=authoryear,bibstyle=apa]{biblatex}
\DeclareLanguageMapping{british}{british-apa}
\begin{document}
\include{TitlePage} %removed several chapters of text
\include{Appendix}
\end{document}


The errors I am receiving are several lines long, thus I have added only the first two:

! Undefined control sequence.
\blx@theformat #1#2#3#4#5#6#7#8->\nameparts
{#1}\ifthenelse {\value {listcou...
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., \hobx'), type I' and the correct
spelling (e.g., I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.
! Undefined control sequence.
<argument> ...artprefix \namepartfamily }\ifempty
{\namepartprefix }{}{\mkbi...

• Try writing it without the curly brackets, as in title=References. – Alenanno Mar 6 '16 at 20:04
• In version 3.3 of biblatex the name handling was substantially revised. biblatex-apa v 6.8 already uses the new name handling and has been available on CTAN (and MikTeX) for a few days now. biblatex` 3.3, however, has only just arrived at CTAN, so it might take another day or so to propagate to all mirrors and TeX Live and MikTeX. – moewe Mar 6 '16 at 20:50