Apparently the font is not found. So make sure that TeX can find the font. 
Probably you need to check whether the OSFONTDIR is set correctly. Otherwise 
copy the to a place e.g. texmf-local en run luatools --generate.

I hop this helps.

Willi 
On 29 Apr 2010, at 21:53, Vyatcheslav Yatskovsky wrote:

> Hi,
> 
> Thanks, Willi, for the idea, but I cannot get it to work. My version of the 
> script
> 
> \starttext
> \definefontsynonym[Wingdings][Wingdings.ttf]
> \definesymbol[box][\getglyph{Wingdings}{\char113}]
> %\def\Check%
> %   {{\tfa\symbol[box]}}
> 
> \symbol[box]
> \stoptext
> 
> 
> gives the following error (I have Wingdings.ttf in my Windows/Fonts folder):
> 
> 
> !define font    : forced type ttf of Wingdings not found
> !define font    : font with name Wingdings is not found
> !define font    : unknown font Wingdings, loading aborted
> ! Font \thedefinedfont=Wingdings.ttf at 12pt not loadable: metric data not 
> found or bad.
> <to be read again>
>                   \relax
> \symbolicsizedfont ...cale \scaledfontsize \relax
>                                                  \thedefinedfont
> \getglyph #1#2->{\symbolicfont {#1}
>                                   \doifnumberelse {#2}\char \donothing #2}
> \dodosymbol ...bol \csname \??ss :#1:#2\endcsname
>                                                  \relax }\relax
> \donormalsymbol ...bol \redosymbol \currentsymbol
>                                                  \fi \fi
> <to be read again>
>                   \stoptext
> l.8 \stoptext
> 
> ?
> 
>> 
>> The approach to using symbols could be done along the following line:
>> 
>> 
>> \definefontsynonym[Dingbats][uzdr]
>> \definesymbol[box][\getglyph{Dingbats}{\char113}]
>> \def\Check%
>>    {{\tfa\symbol[box]}}
> 
> 
> -- 
> Best Regards,
> Vyatcheslav Yatskovsky
> ___________________________________________________________________________________
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