\tightlist been introduced since pandoc 1.14 (see this commit ). The most likely cause of this error is that you are using the template from a previous version and did not update it. This can be fixed by adding a couple of lines to your latex pattern. They can be found in $DATA-DIR/templates/default.latex for regular latex and $DATA-DIR/templates/default.beamer for the beam. You will need to add these two lines (before \begin{document} ):
\providecommand{\tightlist}{% \setlength{\itemsep}{0pt}\setlength{\parskip}{0pt}}
To make sure that this does not happen again with the future evolution of templates, it would be nice to branch out the pandoc-templates repository .
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