paperless ngx Error Updatescript

[xnetworker]

I have a problem when I start the updatescript. I will then receive the error message: [ERROR] in line 93: exit code 0: white executing command pip install -r requirements.txt &> /dev/null

[Coumodo]

can you reply how you solved you issue?
I got the same trying to update my Paperless:

✔️ Stopped all Paperless-ngx Services
⠙ Updating to v2.17.1
[ERROR] in line 159: exit code 0: while executing command "$@" > /dev/null 2>&1

after that I need to restore container from backup.
Indipented of folder (LXC base, /opt/, /opt/paperless) and using the installation script in or "update".