Refused to display 'url' in a frame because it set 'X-Frame-Options' to 'deny'

Still happening. I’ve added the lusca snippet, plus edited my nginx configuration on my server: at “/etc/nginx/sites-available/default”

added:

add_header X-Frame-Options “”;

and

proxy_hide_header X-Frame-Options;

on all my running processes. Has anyone figured out how to get rid of this error once and for all?