problem in setting up gunicorn and django

I am trying to set up gunicorn for Django by following this blog. I created the gunicorn_start script and gave it permission:

    $ sudo chown -R hello:users /webapps/hello_django

    $ sudo chmod -R g+w /webapps/hello_django

Made it executable:

    $ sudo chmod u+x bin/gunicorn_start

But when I run this comman:

    advenio@advenio-VirtualBox:~$ sudo su - hello

    $ bin/gunicorn_start

It gives me an error:

    advenio@advenio-VirtualBox:~$ sudo su - hello

    $ bin/gunicorn_start

    Starting hello_app as hello

    bin/gunicorn_start: line 26: /webapps/hello_django/hello/../bin/gunicorn: No such file or directory

This the `gunicorn_start` script:

#!/bin/bash

NAME="hello_app"                                  # Name of the application

DJANGODIR=/webapps/hello_django/hello             # Django project directory

SOCKFILE=/webapps/hello_django/run/gunicorn.sock  # we will communicte using this unix socket

USER=hello                                        # the user to run as

GROUP=webapps                                     # the group to run as

NUM_WORKERS=3                                     # how many worker processes should Gunicorn spawn

DJANGO_SETTINGS_MODULE=hello.settings             # which settings file should Django use

DJANGO_WSGI_MODULE=hello.wsgi                     # WSGI module name

echo "Starting $NAME as `whoami`"

# Activate the virtual environment

cd $DJANGODIR

source ../bin/activate

export DJANGO_SETTINGS_MODULE=$DJANGO_SETTINGS_MODULE

export PYTHONPATH=$DJANGODIR:$PYTHONPATH

# Create the run directory if it doesn't exist

RUNDIR=$(dirname $SOCKFILE)

test -d $RUNDIR || mkdir -p $RUNDIR

# Start your Django Unicorn

# Programs meant to be run under supervisor should not daemonize themselves (do not use --daemon)

exec ../bin/gunicorn ${DJANGO_WSGI_MODULE}:application \

 --name $NAME \

 --workers $NUM_WORKERS \

 --user=$USER --group=$GROUP \

 --log-level=debug \

 --bind=unix:$SOCKFILE

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