object missing a required value facebook comment

After installing facebook comments on my site and testing, I got the error:

Object missing a required value

Specifically when I checked the box “Also post on facebook”. There was no documentation on this but I figured that it had something to do with the lack of OG markup, which helps the Facebook display content on their site correctly. I added the meta tags below dynamically through javascript and PHP and the error went away. It still didn’t post on my wall though…

<meta property="og:url"                content="http://www.alltherex.com" />
<meta property="og:type"               content="article" />
<meta property="og:title"              content="The Incredibles" />
<meta property="og:description"        content="One of the greatest films of all time!" />
<meta property="og:image"              content="http://alltherex.com/admin/uploads/movies/B00005JN4W.jpg" />

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