I read various wp forums on this exact error and can’t be sure what the fix is for the Mantra child is. Can anyone provide insight on how to fix this. I have pages NOT posts for my site.
The author, updated, hcard details are not part of either WordPress or general WordPress theme specifications.
They are particular content-related tags wanted by external services (like Google).
We plan on adding support for these tags in our themes code, but we don’t have a timeframe for this inclusion yet.