django nginx gunicorn,, start: Job failed to start -

every 1 trying deploying django project using nginx gunicorn,,but when run

sudo service gunicorn start, said, start: job failed start,

here working path,,

the gunicorn.conf file

/etc/init/gunicorn.conf

description "gunicorn application server handling myproject"  start on runlevel [2345] stop on runlevel [!2345]  respawn setuid user setgid www-data chdir /home/parallels/books/mysite   exec myprojectenv/bin/gunicorn --workers 3 --bind unix:/home/parallels/books/mysite/mysite.sock mysite.wsgi:application 

when run

gunicorn --bind 0.0.0.0:8000 mysite.wsgi:application

i can see mysite running

but when try

sudo service gunicorn start

fail,,, following instruction here

any 1 can reply thank much

i know late, in case:

1. in gunicorn.conf see setuid user there user parallels in prompt (it depends of bash settings, name of curent user).
2. there chdir /home/parallels/books/mysite , exec myprojectenv/bin/gunicorn , guess gunicorn location not /home/parallels/books/mysite/myprojectenv/bin/gunicorn. need use appropriate path run gunicorn.

check gunicorn log file find out problems. should here /var/log/upstart/gunicorn.log