Getting pkg_resources.DistributionNotFound: The 'supervisor==3.2.0' distribution was not found and is required by the application?

Question

Getting an error while trying to run a gunicorn script through supervisor. The gunicorn script is running fine while running it directly. I am on ubuntu 16.04 supervisor version : Getting

pkg_resources.DistributionNotFound: The 'supervisor==3.2.0' distribution was not found and is required by the application

while running

sudo supervisorctl reread

my gunicron script to run Django application:

#!/bin/bash

NAME="applicant_screening"                                  # Name of the application
DJANGODIR=/home/applicant-screening-system/screening_backend             # Django project directory
#SOCKFILE=/home/track_ip/run/gunicorn.sock  # we will communicte using this unix socket
USER=root                                        # 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=screening_backend.settings             # which settings file should Django use
DJANGO_WSGI_MODULE=screening_backend.wsgi                     # WSGI module name

echo "Starting $NAME as `whoami`"

# Activate the virtual environment
cd $DJANGODIR
source /home/screen-env/bin/activate
export DJANGO_SETTINGS_MODULE=$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 gunicorn ${DJANGO_WSGI_MODULE}:application \
  --name $NAME \
  --workers $NUM_WORKERS \
  --user=$USER \
  --bind=0.0.0.0:8000 \
  --log-level=debug \
  --log-file=-

Answer 1

This is the version mismatch between the requirement of supervisor and the python version installed. For this you need to:

1. Install Python 2.7. (Since supervisor has a support for 2.* and the support for 3.* is still in development) https://askubuntu.com/a/981279

2. Go to /usr/bin/supervisorctl file.

3. Update the first line to

!/usr/bin/python2

to make the supervisor use the python 2.7 installed instead of python3.

Supervisorctl updated file

4. Rerun the supervisorctl command.