Invalid application id. The given application id is invalid on the page using fbml

Question

I searched extensively, but did not find good answers to this problem. We have fbml running on our site, but in some situations (e.g. http://www.pbs.org/wgbh/pages/frontline/anthrax-files/ ). I also get a message with the message Invalid application identifier: The provided application identifier is invalid - sometimes it even appears twice.

I already launched the pages through the lint-book and made some changes. But I'm at a standstill - in particular, because it does not always appear, only sometimes. Does anyone know what I'm doing wrong?

Thank.

Answer 1

If someone is looking for an answer to this question: the variable that I did not disclose in this question is that we use Disqus on the pages in question. The Facebook app ID that previously worked on Disqus suddenly stopped working. Swapping in the new application identifier allowed for the domain solved the problem.

Answer 2

If this helps, I got this error when using the "Like this on Facebook" widget with the wrong Facebook app id. Unknown to me there was a different application identifier in the og meta tag in the header, and both seemed to conflict with each other.