\tightlist
was introduced with pandoc 1.14 (see this commit). The most probable cause for this error is that you are using a template from a previous version and did not update it. This can be fixed by adding a couple of lines to your latex template. They can be found at $DATA-DIR/templates/default.latex
for regular latex and $DATA-DIR/templates/default.beamer
for beamer. You'll need to add those two lines (before the \begin{document}
):
\providecommand{\tightlist}{%
\setlength{\itemsep}{0pt}\setlength{\parskip}{0pt}}
To make sure this does not happen again with future evolution of the templates, it might be a good idea to fork the pandoc-templates repository.