Error message: 'Cannot read configuration file /usr/local/etc/rtl_airband.conf'

[Amata29]

Hello @ all,
I installed the program V 5.0.0 on Linux Mint using these https://fuzzthepiguy.tech/rtl_airband-debian/ instructions.
By trying to start the program with ''sudo rtl_airband -f'', I get the message: ''Cannot read configuration file /usr/local/etc/rtl_airband.conf''.
What did go wrong? What makes the config file readable? How can I fix this?
Thanks in advance.