content aren’t printed in a page

hello,
I leave below my own _notWorking_ template, I don’t know why the output is an empty <div id=”content”></div> if I click on a title marked as ID) ?>” title=”foo”>.. in portfolio.php. I don’t find the template loaded too, and must be page.php.

online demo:
– https://obertfsp.com/wordpress/about/portfolio/
– https://obertfsp.com/wordpress/about/portfolio/la-quarra-accomodation-in-tuscany/

source: https://rafb.net/p/KEcm4I66.html

thanks