Hi there!
Those are PHP notices which appear when WP_Debug is on. We’ve got them on the list to fix. They shouldn’t affect the functionality of the site or plugin.
Thanks for writing in!
Cheers,
Kyle
This is the most actively maintained, and is by the team which is working on integrating the Rest API into core.
WP-API
It looks like the post content is being inserted before the post header. Did you or someone with access to the site modify the theme recently?
Looks like this issue has been resolved with a domain redirect
