How to solve 'The requested URL was not found on this server' ? Problem solved !!!

If your problem is "The requested URL was not found on this server.”
“Apache/2.4.41 (Ubuntu) Server at YOURDOMAINNAME.com Port 80."
or
“Apache/2.4.41 (Ubuntu) Server at YOURDOMAINNAME.com Port 443."
then see how I solved it.
Download the code here :
drive.google.c...