Netbox upgrade issue - service can't start (from 2.2.6 to 2.8.9)

[chaputj]

Environment

• Python version: 2.7.5 (I know Python 3.6 is installed but python ––version reports 2.7.5)
• NetBox version: 2.8.9
• CentOS Linux release 7.8.2003 (Core)

Steps to Reproduce

1. Netbox 2.2.6 was directly installed in /opt/netbox so I renamed it /opt/netbox-2.2.6
2. Install Redis (and add Redis configuration to the configuration.py file)
3. Had to remove python34 (so python36 and all requirements could install)
4. Follow the migration procedure with Netbox 2.8.9 (https://netbox.readthedocs.io/en/stable/installation/upgrading/)
5. Upgrade successful without any errors

Expected Behavior

Upgrade completed successfully and service can start (as before the upgrade)

Observed Behavior

The netbox service can't start anymore

Installed gunicorn (following https://netbox.readthedocs.io/en/stable/installation/4-http-daemon/#gunicorn-configuration & https://netbox.readthedocs.io/en/stable/installation/4-http-daemon/#systemd-configuration

Same thing

systemctl status netbox attached as a screenshot.

Thank you

[lampwins]

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