I am trying to process a file using the ConTeXt minimals and MK II that now complains:
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{/Users/alancbowen/Library/texmf/fonts/map/pdftex/context/tasgreek.map}
! Argument of \next has an extra }.
<inserted text> 
                \par 
<to be read again> 
                   }
<argument> ...{,\CCC:4:124 \CCC:4:126 \CCC:4:124 }
                                                  \hskip \datesignal \def \b...

\p!compareprocessaction ...commalistelement {#3}#2
                                                  \fi \fi 
\next2 #1,->\p!doprocessaction {#1}
                                   \doprocesscommaitem 
\processnextcommalist ...odoprocesscommaitem #4#5,
                                                  ]\relax \global \advance \...
...
l.29 F
      inally, I have supplied extensive footnotes and comments explicating t...

I have tried various things to locate the error but without success. Can anyone tell me what this error message means and where I should look to solve the problem? 

I do have 

\definetext[ArticleTitlePage][footer]
[\tfx\AuthorName\hfill\currentdate\hfill{\tf 1}]

in my environment file, but this seems to be OK.

Many thanks in  advance.

Alan