It seems that whenever I use /etc/init.d/nginx restart I am always receiving an error. But using /etc/init.d/nginx start or /etc/init.d/nginx stop everything works well. I'm using Ubuntu 14.04 with mainline ppa. I used the ppa thing since adding the direct source of nginx mainline/stable in Ubuntu and installing it does not generate the "sites-enabled" and "sites-available" folders. Plus, hhvm says that the nginx installation is corrupted. Using the "warn" feature of the error log outputs blank. That is why I changed it to debug.

For reference, I also attached the conf files.