how to run remy

[leelelelelele]

I don't know how to run it. When I followed the steps in README and run ./remy, I got like this:

An input configuration protobuf must be provided via the cf= option.
You can generate one using './configuration'._

please tell me what should I do to run remy and what is 'option' for.
I am really new to it. Sorry to interrupt. I will appreciate your reply, thank you!