That has already been reported on the pgfplots bugtracker
https://github.com/pgf-tikz/pgfplots/issues/350
and here on the mailing list
https://mailman.ntg.nl/pipermail/ntg-context/2020/097514.html
Here I quote Aditya's workaround:
I have no clue what pgfplotsbinary.data.code.tex does, but simply
bypassing that works for the simple example above.
Simply create an empty file with the name pgfplotsbinary.data.code.tex in
your current directory and compile your example.
Note that if your code uses any of the features which are provided by this
file (and I am not sure what they are), then it will fail. But at least
this "fix" works for the simple example above.
On 24/04/20, 20:23, Jairo A. del Rio wrote:
> I'm testing LMTX with documents I've written for ConTeXt MKIV. I've copied
> the third party module folder from ConTeXt and some of them work like a
> charm (t-vim, TikZ, etc.). Nonetheless, I find PGFPlots just doesn't work.
> I've tried with the minimal example:
>
> \usemodule[pgfplots]
> \starttext
> Hola
> \stoptext
>
> and LMTX gives the following error message (omitting spaces):
>
> tex error > tex error on line 42 in file
> pgfplotsbinary.data.code.tex: ! Undefined control sequence
> l.42 \catcode`\ =11^^I\expandafter\xdef\csname pgfp@bin@
>
> \the\counter^^I\endcsname{^^20}\endgroup\advance\counter by1
> lua error:
> ?
>
> The control sequence at the end of the top line of your error message was
> never
> \def'ed. You can just continue as I'll forget about whatever was undefined.
>
> Why does it happen and how to make the code work?
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