Configuration problem

I have installed Event Booking, and I am not getting anywhere with the configuration. I can't save the settings because the error "3 arguments are required, 2 given" is displayed. I can't find the place where arguments are missing.
Also, I can't select a post in "Privacy URL" and "T&C". Moreover, the frontend design is bad.
If you want, I can send you the Joomla access data.
Thanks in advance!
Stephan

As replied via support ticket, this causes by an issue with German language file for the site updated from Joomla 3 to Joomla 4. I just updated the German language package of the site to latest version and the error is gone

Regards,

Tuan