deploying my app into render

I am new to django and this is the first time for me. it keeps giving the same error build fails when i try to deploy in Render.

Sep 28 09:10:09 AM bash: command not found
Sep 28 09:10:09 AM ==> Build failed :disappointed:

I have copied the following lines into the file but it keeps giving the same error:

#!/usr/bin/env bash

exit on error

set -o errexit
pip install -r requirements.txt
python collectstatic --no-input
python migrate

also i have this command line on start command: gunicorn portfolio.wsgi:application
my django project is called portfolio.