Kerlink iFemtoCell-evolution Gateway (Configuring chirpstack gateway Bridge)

I want to access the chirpstack Bridge configuration file to configure that. I installed its ipk file but when I enter :
cat /etc/chirpstack-gateway-bridge/chirpstack-gateway-bridge.toml
to access that, it says No such file or directory
even when I run
chirpstack-gateway-bridge configfile > chirpstack-gateway-bridge.toml
to generate a new configuration file, it says: Command not found.
I would appreciate it if someone could advise me how I can access that file to configure.
Thank you very much