In change 360895, we added pandoc to list of installed packages so that we could render R Markdown reports to pdf/html on stat1002. Unfortunately, it seems the installed version is 1.12.2.1 (very outdated, from 2013) but the rmarkdown package requires pandoc >= 1.12.3 to render documents.
Could someone please upload a more recent version of pandoc to WMF's repo?