# undefined control sequence \abx@aux@sortscheme

I am trying to start a basic tex document with bibtex citations as follows:

\documentclass{article}

\usepackage[backend=bibtex]{biblatex}
\bibliography{biblo}

\begin{document}
\printbibliography
\end{document}

However, when I run pdflatex mytexfile.tex I receive the error that \abx@aux@sortscheme is undefined. How can I resolve this?

• The syntax should be \addbibresource{biblo.bib}. Sep 9, 2016 at 22:01
• I think this error occurs after having changed some options to biblatex or removing the inclusion itself, then recompiling --> there is some code left in .aux file. Try to remove the aux-file
– user31729
Sep 9, 2016 at 22:04
• @Bernard: Yes, but \bibliography{biblo} still works (however not recommended)
– user31729
Sep 9, 2016 at 22:04
• @Christian Hupfer: That Biblatex is really a good lad… Sep 9, 2016 at 22:06
• @Bernard: On page 71 of current biblatex.pdf: \bibliography ... The legacy command... and as a marginnote: Deprecated (see at the bottom of the page)
– user31729
Sep 9, 2016 at 22:08