Sites-Enabled for Unicorn+Nginx with Rails

Hi, I have a problem with Rails configuration and setup on server.

I have Rails application, and I hosted it using Unicorn and Nginx, but now I can’t access to application. I did pull origin master and I pulled the latest changes but I also did sudo service nginx stop. Now when I did ngnix start I am getting an error: nginx: [emerg] unknown directive “rails_env” in /etc/nginx/sites-enabled/default:10

My default file is:

server {

        listen 80 default_server;

        listen [::]:80 default_server ipv6only=on;



        server_name example.com;

        rails_env   production;

        root         /home/rails/public;



        # redirect server error pages to the static page /50x.html

        error_page   500 502 503 504  /50x.html;

        location = /50x.html {

            root   html;

        }

}

Unicorn is running.

Any help please,

Bojan