"configuration file /etc/nginx/nginx.conf test failed": How do I know why this happened?

I'm an nginx noob trying out this [this][1] tutorial on nginx 1.1.19 on ubuntu 12.04. I have [this][2] nginx config file. When I run this command the test fails: $ sudo service nginx restart Restarting nginx: nginx: [crit] pread() "/etc/nginx/sites-enabled/csv" failed (21: Is a directory) nginx: configuration file /etc/nginx/nginx.conf test failed How do I know why the nginx.conf test failed? [1]: http://nginx.org/en/docs/beginners_guide.html [2]: https://gist.github.com/anonymous/9474452