Genius. I changed the papersize parameter variable value from 'a4' to 'A4' 
and the problem disappeared. Thanks for the help -- that would have taken 
me forever to track down.

On Monday, 7 August 2017 14:30:56 UTC+9:30, John MacFarlane wrote:
>
> Can you give exact instructions (including any inputs) for 
> recreating the problem, so we can test? 
>
> Note: you might try setting papersize to 'A4' (capital 
> letter A), instead of 'a4'.  I doubt that's the issue 
> here, but it is one thing we've fixed recently (pandoc 
> dev version will automatically capitalize 'a4' for 
> ConTeXt output). 
>
> +++ David Nebauer [Aug 06 17 19:55 ]: 
> >   When creating pdf output using context, pandoc fails with the error 
> >   message: 
> >   tex error on line 15 in file /tmp/tex2pdf.2478/input.tex: ! Missing 
> >   number, treated as zero 
> >   On creating context output line 15 turns out to be: 
> >   \definefontfeature[default][default][script=latn, 
> >   protrusion=quality, expansion=quality, itlc=yes, textitalics=yes, 
> >   onum=yes, pnum=yes] 
> >   On processing the context output directly I get the following expanded 
> >   error message for line 15: 
> >   Dimensions can be in units of em, ex, in, pt, pc, 
> >   cm, mm, dd, cc, nd, nc, bp, or sp; but yours is a new one! 
> >   I'll assume that you meant to say pt, for printer's points. 
> >   To recover gracefully from this error, it's best to 
> >   delete the erroneous units; e.g., type `2' to delete 
> >   two letters. (See Chapter 27 of The TeXbook.) 
> >   tex error       > tex error on line 15 in file FILEPATH.tex: ! Illegal 
> >   unit of measure (pt inserted) 
> >   In case it helps, here is the context output up to and including line 
> >   15: 
> >   % Enable hyperlinks 
> >   \setupinteraction 
> >     [state=start, 
> >     title={Minimal Working Example}, 
> >     style=, 
> >     color=blue, 
> >     contrastcolor=] 
> >   % make chapter, section bookmarks visible when opening document 
> >   \placebookmarks[chapter, section, subsection, subsubsection, 
> >   subsubsubsection, subsubsubsubsection][chapter, section] 
> >   \setupinteractionscreen[option=bookmark] 
> >   \setuptagging[state=start] 
> >   \setuppapersize[a4] 
> >   % use microtypography 
> >   \definefontfeature[default][default][script=latn, protrusion=quality, 
> >   expansion=quality, itlc=yes, textitalics=yes, onum=yes, pnum=yes] 
> >   Pandoc version is 1.17.2 on debian/testing. 
> > 
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