upgrading to 7.3 php

I upgraded to 7.3 php and now I can’t log in and the front page is different.
I ll use a backup recovering and go back to the old php.

I am using
https://www.ads-software.com/themes/twentysixteen/

Just letting you know that upgrading may not always works.

• This topic was modified 5 years, 3 months ago by nkwebdesign.

The page I need help with: [log in to see the link]