Yes, I get it too. It's because booklet expects a publisher name;
if you add a line
publisher = {Publisher},
to the bibtex entry you can see this.
I think this can be fixed in
context/tex/texmf-context/tex/context/bib/bibl-apa.tex by changing
this function:
\setuppublicationlayout[booklet]{%
\insertauthors{}{ }{\insertthekey{}{. }{}}%
\insertpubyear{(}{). }{}%
\inserttitle{\bgroup }{\egroup \insertseries{ (}{)}{}. }{}%
\insertedition{ }{ edition.}{}%
\insertpublisher{ }{.}{.}%
\insertpages{}{p. }{}%
\insertnote{ }{.}{}%
}
Alter the following line --
\insertpublisher{ }{.}{.}%
to
\insertpublisher{ }{.}{}%
-- then I think you'll need to remake the formats (see
http://wiki.contextgarden.net/ConTeXt_Minimals#Remaking_formats ).
See
http://dl.contextgarden.net/modules/bibmod-doc/doc/context/bib/bibmod-doc.pdf
section 6 for some explanation of what's going on here.
Sorry I don't have time to test any of this right now but it should point
you in the right diretion at least.
Pont
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