I can’t get the example in the m-barcodes module to work. I have no urgent
need to print barcodes; I was just curious. I'm writing in case I found an
easily corrected bug.

The release notes from 2010.05.08 call this module mkiv only. But according
to the log, the file m-pstricks.mkii is used. And that seems to be the
proximate cause of the error.

mjg

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ConTeXt  ver: 2010.06.23 12:45 MKIV  fmt: 2010.7.6  int: english/english

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command: context "barcode-test.tex"

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file: barcode-test.tex

\usemodule[barcodes]

\starttext

% this is copied straight from m-barcodes.mkiv

\startPSTRICKS
\pspicture(-4mm,-1mm)(38mm,26mm)
 \psbarcode{9781860742712}{includetext guardwhitespace}{ean13}%
 \endpspicture
\stopPSTRICKS

\stoptext

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log before the error:

systems         : begin file barcode-test-pstricks-0001 at line 1
system          : module pstric loaded

(/context/tex/texmf-context/tex/context/base/m-pstricks.tex
(/context/tex/texmf-context/tex/context/base/m-pstricks.mkii
! I can't find file `multido'.
<argument> \input multido
                          \relax \input pstricks \relax \input pst-plot
\rel...

\firstoftwoarguments #1#2->#1

l.47 ...s}{using indirect method; enable write18}}