Invalid Application ID: The provided Application ID is invalid on page with fbml

Question

I've searched extensively but haven't found any good answers for this issue. We've got fbml working on our site but in some situations (like http://www.pbs.org/wgbh/pages/frontline/anthrax-files/) I also get a message saying Invalid Application ID: The provided Application ID is invalid - on occasion it even comes up twice.

I've run the pages through face book's lint already and made some changes. But I'm stumped - in particular because it doesn't always appear, only sometimes. Anyone have any insights as to what I'm doing wrong?

Thanks.

Answer 1

If anyone is looking for the answer to this: a variable I failed to disclose in this question is that we use Disqus on the pages in question. The Facebook Application ID that previously worked in Disqus stopped working suddenly. Swapping in a new Application ID authorized to the domain solved the issue.

Answer 2

If it helps, I got this error when using a "Like this on Facebook" widget with the wrong Facebook App ID. Unknown to me there was a different App ID in an og meta tag in the header and the two seemed to conflict with each other.