Metafun error

[John Culleton <john@wexfordpress.com>]

Just got back into Metafun. I used the example program from page 5 of
the manual:
------------------------------------------
\setupcolors[state=start]
\starttext
\startuseMPgraphic{dummy}
fill fullcircle scaled 5cm withcolor red;
\stopuseMPgraphic
\useMPgraphic{dummy}
\stoptext
------------------------------------------
When I run 

texexec test.tex I get:
-----------------------------
This is MetaPost, Version 0.641 (Web2C 7.3.7x)
(test-mpgraph.mp
>> spotcolors
>> true
! Equation cannot be performed (numeric=boolean).
<to be read again>
                   ;
l.23 spotcolors := true ;
---------------------------
on the second pass. 

If I eliminate the red color it still doesn't work.

The file test-mpgraph.mp contains these lines which look ok:

cmykcolors := true ;
spotcolors := true ;
color OverlayColor, OverlayLineColor ;

If I just generate the graphic with

texexec --mptex test.tex
that works OK.
Any ideas? 



-- 
John Culleton