I don't have my notebook available for some days, hence I was trying to answer to a TeX.SE question using Overleaf.
I've realized, unfortunately, that Overleaf hasn't the most recent release of the packages (for example, biblatex).
I would like to see the versions used, adding \listfiles at the top of my code but it doesn't work.
\listfiles
\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage[british]{babel}
\begin{document}
\just to create an error and get the log on Overleaf
\end{document}

\listfilesdoing its work. – egreg Dec 03 '16 at 08:43\ref{foo};-) – imnothere Dec 03 '16 at 08:54