Using the NTG-style to reprocess an older article I get the following error:

ConTeXt  ver: 2012.03.10 13:15 MKIV
...
! Undefined control sequence.
...
system          > tex > error on line 358 in file exammaps2.tex: Undefined control sequence ...
\setupfootnotedefinition ->\setupnotedefinition
                                                [\v!footnote ]
l.358 \setupfootnotedefinition

The style file is marked:
%\module [
%  file=s-map-se,
%  version=2005.02.03,
%  title=\CONTEXT\ Style File,
%  subtitle=\MAPS\ basis stijl,
%  author={Hans Hagen, Taco Hoekwater and Siep Kroonenberg},
%  date=\currentdate,
%  copyright={NTG / MAPS}%
%]

Some change in the style file needed?

Hans van der Meer