Since ...
"There is zoner installator which is taking care Moodle installation. It upgrade Moodle from working 3.7.1 to 3.7.3 and now I get this error (at topic). Is there any idea which can cause this and how to fix it?"
Shouldn't your first contact
for assistance go to your provider?
If you did, mind passing along ... here in public view .. what their response was.
Am assuming you pay for support where you host. No one here in Moodle Community gets paid for providing free suggestions .. which may or may not work with where you host. Only someone who happens to host where you host and has used providers scripts could possibly have an answer.
The official Moodle docs:
https://docs.moodle.org/37/en/Upgrading
SoS, Ken