facebook open graph : custom object submission error
===

When I use the following to post an action to FB

curl -F 'access_token=AAAFxEPEoxQgBAGCUyzmyKGDJLoKe2uz1I823Uf8CUBfMagfrqvkRgNcif2ipJGDeNZBc9JBao1xB2pulEggmLF4wFC3HU8wqkWZAc3zAZDZD' \
     -F 'topic=http://myurl.com/467564296596508' \
        'https://graph.facebook.com/me/customapp:custom'


Object at URL http://myurl.com/467564296596508 has og:type of 'website'. The property 'topic' requires an object of og:type 'customapp:custom'.

Source code of http://myurl.com/467564296596508

    <html>
    <head prefix="og: http://ogp.me/ns# fb: http://ogp.me/ns/fb# customapp: http://ogp.me/ns/fb/customapp#">
        <title>Content Title</title>
        <meta property="og:title" content="Content Title" />
        <meta property="og:image" content="http://myurl.com/img_default.png" />
        <meta property="og:description" content="Custom App Heading" />
        <meta property="fb:app_id" content="405792556107016" />
        <meta property="og:url" content="http://myurl.com/467564296596508" />
        <meta property="og:type" content="customapp:custom" />

    </head>
    <body>
    </html>

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How do I remove this error?

Regards
Ajay