nginx -T
nginx: [emerg] "server" directive is not allowed here in /etc/nginx/sites-available/default:1
nginx: configuration file /etc/nginx/nginx.conf test failed


nginx.conf:

user www-data;
worker_processes auto;
pid /run/nginx.pid;
include /etc/nginx/modules-enabled/*.conf;
include /etc/nginx/sites-available/*;
...