[OS X TeX] an error using \head in \ConTeXt\

[Dalyoung]

Dear all,

I tried to compile
\startitemize
\head ...
\head ...
\stopitemize
  following the example in ConTeXt manual.
But I got an error message.

columns        : balanced in 1 step(s)
! Argument of \complexdoitemgrouphead has an extra }.
<inserted text>
                 \par
<to be read again>
                    }
\doattributes ...name #1#2\@EA \endcsname \fi {#4}
                                                   \dostopattributes
\complexdoitemgrouphead ...olor {\ignorespaces #2}
                                                   }\iftextitems 
\removeunwan...
l.80

?

If I use \item instead \head, there is no problem at all.
What is wrong with my text?

\startitemize
\head first head
      This line is the first line.
\head second head
       This line is the second line.
\head third head
      This line is the third line.
  \stopitemize

Thank you.

Regards,
Dalyoung

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