title: Getting below error while deploying my python app to heroku
body: <p>Getting below error while deploying my python app to heroku.</p>
  <p>Use a production WSGI server instead.
  2021-11-10T10:10:38.172157+00:00 app[web.1]: * Debug mode: on
  2021-11-10T10:10:38.176250+00:00 app[web.1]: * Running on <a href="http://127.0.0.1:8000/" rel="nofollow noreferrer">http://127.0.0.1:8000/</a> (Press CTRL+C to quit)
  2021-11-10T10:10:38.176959+00:00 app[web.1]: * Restarting with stat
  2021-11-10T10:10:38.178177+00:00 app[web.1]: Exception occured!
  2021-11-10T10:10:38.180255+00:00 app[web.1]: * Running on http://localhost:9000/ (Press CTRL+C to quit)
  2021-11-10T10:10:38.311580+00:00 app[web.1]: [2021-11-10 10:10:38 +0000] [384] [INFO] Starting gunicorn 20.1.0
  2021-11-10T10:10:38.311912+00:00 app[web.1]: [2021-11-10 10:10:38 +0000] [384] [ERROR] Connection in use: ('0.0.0.0', 13829)
  2021-11-10T10:10:38.311949+00:00 app[web.1]: [2021-11-10 10:10:38 +0000] [384] [ERROR] Retrying in 1 second.
  2021-11-10T10:10:39.313310+00:00 app[web.1]: [2021-11-10 10:10:39 +0000] [384] [ERROR] Connection in use: ('0.0.0.0', 13829)
  2021-11-10T10:10:39.313354+00:00 app[web.1]: [2021-11-10 10:10:39 +0000] [384] [ERROR] Retrying in 1 second.
  2021-11-10T10:10:40.314947+00:00 app[web.1]: [2021-11-10 10:10:40 +0000] [384] [ERROR] Connection in use: ('0.0.0.0', 13829)
  2021-11-10T10:10:40.315652+00:00 app[web.1]: [2021-11-10 10:10:40 +0000] [384] [ERROR] Retrying in 1 second.
  2021-11-10T10:10:41.317379+00:00 app[web.1]: [2021-11-10 10:10:41 +0000] [384] [ERROR] Connection in use: ('0.0.0.0', 13829)
  2021-11-10T10:10:41.317596+00:00 app[web.1]: [2021-11-10 10:10:41 +0000] [384] [ERROR] Retrying in 1 second.
  2021-11-10T10:10:42.319984+00:00 app[web.1]: [2021-11-10 10:10:42 +0000] [384] [ERROR] Connection in use: ('0.0.0.0', 13829)
  2021-11-10T10:10:42.320026+00:00 app[web.1]: [2021-11-10 10:10:42 +0000] [384] [ERROR] Retrying in 1 second.
  2021-11-10T10:10:43.320944+00:00 app[web.1]: [2021-11-10 10:10:43 +0000] [384] [ERROR] Can't connect to ('0.0.0.0', 13829)
  2021-11-10T10:10:43.346518+00:00 app[web.1]: Exception occured!</p>