Root APP node not recognized on content page

Using fw7 on a content page, and trying to select an item from the head page using Expression selector.

Getting this error


However it is set:
Screen Shot 2020-02-05 at 9.58.53 AM

Screen Shot 2020-02-05 at 10.02.32 AM

Related, I can no longer select anything from parent page even if this error does not display.

Did I go wrong somewhere?

Thanks!