Hi,
I run into this error after updating my ConTeXt version.
Small (but not minimal) example attached.
mtx-context | current version: 2018.10.18 00:07
Peter
\startuniqueMPgraphic{column:bg}
fill OverlayBox withcolor yellow;
\stopuniqueMPgraphic
\defineoverlay[columnbg][\uniqueMPgraphic{column:bg}]
\definecolumnset[TOC][n=4]
%\setupcolumnset[TOC][background=columnbg]% works ok
\setupcolumnset[TOC][1][background=columnbg]% any indexed setup fails
% in my real world example the complete third argument is printed instead
\starttext
\startcolumnset[TOC]
\input tufte.tex
\stopcolumnset
\stoptext
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