Debian – Running python script as a daemon in debian

I'm trying to run my python script as a service… But I'm getting this error when I call sudo update-rc.d mylistener start:

Use of uninitialized value $ARGV[1] in pattern match (m//) at /usr/sbin/update-rc.d line 192.

update-rc.d: error: expected NN after start

Here is my init script mylistener:

#! /bin/sh
### BEGIN INIT INFO
# Provides:          mylistener
# Required-Start:    $remote_fs $syslog
# Required-Stop:     $remote_fs $syslog
# Default-Start:     S
# Default-Stop:      0 6
# Short-Description: This is the description.
# Description:       This is the description.
### END INIT INFO

DAEMON=/srv/example.org/public/env/bin/python
ARGS=/srv/example.org/public/my_listener.py
PIDFILE=/srv/example.org/my_listener.pid

case "$1" in
  start)
    echo "starting server"
    /sbin/start-stop-daemon --start --pidfile $PIDFILE \
        --user www-data --group www-data \
        -b --make-pidfile \
        --chuid www-data \
        --exec $DAEMON $ARGS
    ;;
  stop)
    echo "stopping server"
    /sbin/start-stop-daemon --stop --pidfile $PIDFILE --verbose
    ;;
  *)
    echo "Useage: /etc/init.d/mylistener {start|stop}"
    exit 1
    ;;
esac

exit 0

Can anyone see where I'm going wrong? This is running on a debian server.