we8u – thank you very much! I was having this same problem and didn’t get a response elsewhere about how to fix it. I really appreciate you taking the time to share this. I installed the new plugin and the error has been corrected.
Thank you again!
I’m having this same issue. Facebook comments disappeared completely after I upgraded WP. The app secret vanished after the update, so I entered it again. Now Facebook comments do show up, but with the error mentioned above. Code is still on every page, in spite of the app id and app secret being correct.
