Include PDF Fails

[Thangalin <thangalin@gmail.com>]

Hi,

I am trying to include a single test page in my document. The
following code fails to set the PDF as the background layer for the
cover page. I've tried several variations
(http://wiki.contextgarden.net/Including_pages_from_PDF_documents),
but nothing works. It seems to be a problem with this specific PDF
being included.

The code:

-- 8< --

\def\PictureFrontCover{http://www.education.gov.yk.ca/pdf/pdf-test.pdf}

\definelayer[page:CoverPicture][
  x=0mm,y=0mm,width=\paperwidth,height=\paperheight,
]

% Set the layer content to be an image that is scaled to fit the page.
\setlayer[page:CoverPicture]{%
  \externalfigure[\PictureFrontCover][
    width=\paperwidth,height=\paperheight,
  ]
}

\starttext
\startfrontmatter
\setupbackgrounds[page][background=page:CoverPicture]
\startstandardmakeup
\stopstandardmakeup
\setupbackgrounds[page][background=]
\stopfrontmatter

\startbodymatter
  Hello world!
\stopbodymatter
\stoptext

-- 8< --

Thoughts?
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