Seahub not starting 9.0.16

Hi all,
I have upgraded the seafile server (pro version) to 9.0.16 and seahub doesn’t start.
The seafile starts in normal way.
I don’t know where to start, if I run ./ start I get:
Error: Seahub failed to start.
Please try to run “./ start” again.
I have tried severel time.
Last line in seahub.log is:
seafevents:61 is_audit_enabled audit is enabled

Could someone give me a hint please, where to start?
Thank you