SA,
After viewing it in the scraper and looking down further in the head I see what you talking about now. Just not sure where it's coming from.
When I remove this bit of code in my index.template they error goes away.
// Output any remaining HTML headers. (from mods, maybe?)
echo $context['html_headers'];
But I am not sure what that is in, hook, template maybe
EDIT: I found the source, it was being outputting by my SEO Mod. Located the code and removed the code for the author meta tag. Debugged it in FB again and the error is gone. So looks like all is good now.
-Thanks