Hello.

I downloaded showfont.pdf and I tried the first example:

\starttext

\definetypeface [zapf] [cg] [calligraphy] [chancery]

\switchtotypeface [zapf] [12pt,cg]

\dorecurse{10}{\input tufte}

\stoptext


but I received the error message "metric file not found".

This is the log file:
==========================================
This is pdfTeX, Version 3.1415926-1.40.11 (TeX Live 2010) (format=cont-en 2010.12.28)  31 DEC 2010 18:37
entering extended mode
 restricted \write18 enabled.
 %&-line parsing enabled.
 (/usr/local/texlive/2010/texmf/web2c/natural.tcx)
**04-fonts.tex \emergencyend
(./04-fonts.tex

ConTeXt  ver: 2010.07.30 11:35 MKII  fmt: 2010.12.28  int: english/english

system          : cont-new loaded
(/usr/local/texlive/2010/../texmf-local/tex/context/base/cont-new.tex
systems         : beware: some patches loaded from cont-new.tex
(/usr/local/texlive/2010/../texmf-local/tex/context/base/cont-new.mkii))
system          : cont-fil loaded
(/usr/local/texlive/2010/../texmf-local/tex/context/base/cont-fil.tex
loading         : ConTeXt File Synonyms
)
system          : cont-sys.rme loaded
(/usr/local/texlive/2010/../texmf-local/tex/context/user/cont-sys.rme
(/usr/local/texlive/2010/../texmf-local/tex/context/base/type-def.mkii)
(/usr/local/texlive/2010/../texmf-local/tex/context/base/type-siz.mkii)
(/usr/local/texlive/2010/../texmf-local/tex/context/base/type-one.mkii))
system          : 04-fonts.top loaded
(./04-fonts.top)
bodyfont        : 12pt rm is loaded
language        : patterns nl->texnansi:texnansi->1->2:2 nl->ec:ec->2->2:2 us->
ec:ec->3->2:3 de->texnansi:texnansi->4->3:3 de->ec:ec->5->3:3 da->ec:ec->6->2:2
 sv->ec:ec->7->2:2 gb->ec:ec->8->2:2 fr->texnansi:texnansi->9->2:2 fr->ec:ec->1
0->2:2 es->ec:ec->11->2:2 ca->ec:ec->12->2:2 it->texnansi:texnansi->13->2:2 it-
>ec:ec->14->2:2 la->ec:ec->15->2:2 pt->texnansi:texnansi->16->2:2 pt->ec:ec->17
->2:2 ro->ec:ec->18->2:2 pl->pl0:pl0->19->2:2 pl->ec:ec->20->2:2 pl->qx:qx->21-
>2:2 cs->il2:il2->22->2:2 cs->ec:ec->23->2:2 sk->il2:il2->24->2:2 sk->ec:ec->25
->2:2 hr->ec:ec->26->2:2 sl->ec:ec->27->2:2 tr->ec:ec->28->2:2 tk->ec:ec->29->1
:2 lt->l7x:l7x->30->2:2 agr->agr:agr->32->2:2 fi->ec:ec->33->2:2 hu->ec:ec->34-
>2:2 ru->t2a:t2a->36->2:2 uk->t2a:t2a->37->3:3 loaded
specials        : dvips loaded
\openout3 = `04-fonts.tui'.

\openout0 = `04-fonts-mpgraph.mp'.

\openout0 = `mpgraph.mp'.

systems         : system commands are enabled
language        : language en is active
specials        : loading definition file tpd
(/usr/local/texlive/2010/../texmf-local/tex/context/base/spec-tpd.mkii
specials        : loading definition file fdf
(/usr/local/texlive/2010/../texmf-local/tex/context/base/spec-fdf.mkii))
publications    : file 04-fonts.bbl not found, waiting for bibtex
systems         : begin file 04-fonts at line 1
! Font \*zapf12ptcgtfcg*:=TeXGyreChorus-MediumItalic at 12.0pt not loadable: Me
tric (TFM) file not found.
<to be read again>
                   \relax
\definefontglobal ...dcsname \lastfontname \relax
                                                  \expandafter \let \expanda...

\xxdododefinefont ...tspec {#4}\newfontidentifier
                                                  \let \localrelativefontsiz...

\fontstrategy ...me \fontclass #2#3#4#5\endcsname
                                                  \tryingfontfalse \fi
<inserted text> ...yle \fontalternative \fontsize
                                                  \fi \iftryingfont \fontstr...

\synchronizefont ...strategy \the \fontstrategies
                                                  \relax \fi \iftryingfont \...
...
l.3 \switchtotypeface [zapf] [12pt,cg]
                                     
? X
 
Here is how much of TeX's memory you used:
 982 strings out of 456094
 15626 string characters out of 2517944
 4851573 words of memory out of 7259343
 41916 multiletter control sequences out of 15000+200000
 82418 words of font info for 37 fonts, out of 3000000 for 9000
 396 hyphenation exceptions out of 8191
 38i,1n,61p,227b,542s stack positions out of 5000i,500n,10000p,200000b,50000s
No pages of output.
PDF statistics:
 0 PDF objects out of 1000 (max. 8388607)
 0 named destinations out of 1000 (max. 500000)
 1 words of extra memory for PDF output out of 10000 (max. 10000000)
==========================================

Is there anyone who can help me? Many thanks.

Sam Qasbah