Ubuntu 22.04 seafile 11 upgrade but can not start seahub

Today, I struggled to upgrade and ended up unable to start Seahub. I am in a hurry.
The error message is as follows:

:/opt/seafile/seafile-server-latest$ ./seahub.sh start

LC_ALL is not set in ENV, set to en_US.UTF-8
Starting seahub at port 8000 …
Traceback (most recent call last):
File “/opt/seafile/seafile-pro-server-11.0.4/seahub/thirdpart/bin/gunicorn”, line 8, in
sys.exit(run())
...
...
AttributeError: ‘NoneType’ object has no attribute ‘init_db_session_class’
Error:Seahub failed to start.
Please try to run “./seahub.sh start” again

I appreciate all the guidance and assistance.

It is likely you forgot to upgrade Python libraries. You can check the upgrade document: Upgrade notes for 11.0.x - Seafile Admin Manual

thanks for the reply, but i had install the lib aready…