Hello my guess is this symbolic link is missing:
frappe@ubuntu:~/frappe-bench$ ls -al /etc/nginx/conf.d/frappe-bench.conf
lrwxrwxrwx 1 root root 43 Mar 20 2018 /etc/nginx/conf.d/frappe-bench.conf -> /home/frappe/frappe-bench/config/nginx.conf
Here’s how to restore that [solution] 'supervisorctl start all' has no response or affect - #2 by clarkej
A forum search on this “configuration file /etc/nginx/nginx.conf test failed” will land you more case pointers.
One other request tip - to copy and paste the problem traceback adds to the forum search ‘inventory’ - an snapshot image is not text searchable! - and also means no need to manually enter fussy search string paths to browse code and the forum…