Am 10.09.2014 um 18:37 schrieb Aditya Mahajan <adit...@umich.edu>:
> Hi,
>
> There was a question on TeX.SX about an error message
> http://tex.stackexchange.com/questions/200474/setuppagenumberinglocation-causes-problem-in-context
>
> The following MWE shows the same error
>
> \setupfootertexts[\namedheadnumber{chapter}]
> \setuppagenumbering[location=,alternative=doublesided]
>
> \starttext
>
> \completecontent
>
> \chapter{Creating device driver}
>
> \section{How to create the}
>
> Chapter text
>
> \stoptext
>
> which gives
>
> lua error > error on line 8 in file /tmp/test.tex:
>
> ...uild/src/tex/texmf-context/tex/context/base/strc-doc.lua:904: attempt to
> index field 'numbers' (a nil value)
> stack traceback:
> ...uild/src/tex/texmf-context/tex/context/base/strc-doc.lua:904: in
> function 'getsectionnumber'
> [\directlua]:1: in main chunk
>
> The error is weird because it only appears when all parts of the minimal
> example are present. If I comment either or `location=,` or
> `alternative=doublesided` or `\completecontent` or `\section{...}`, the error
> goes away!
>
> Any thoughts?
The error arises only when there is no aux file. A alternative to
\namedheadnumber{XXX} is \getmarking[XXXnumber].
\setupfootertexts[{\getmarking[chapternumber]}]
Wolfgang
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