PowerDNS How to set up a reverse zone in BIND format?

Question

Domain Name System

Good afternoon!
I set up a PowerDNS server for the local zone "gspk". Bind-backend is used to store data.
pdns.conf
Forward zone configured and working successfully gspk.zone
Reverse zone also configured, but can't get responses with server name
9.168.192.in-addr.arpa
Forward request succeeds
I make reverse request
Event log
Problem, I think, in config syntax in the BIND format, in which, unfortunately, I am not strong.
Thank you in advance.