Hi, I'm trying to run the backend, by following the readme, but I'm getting prompted for a key. This isn't in the instructions, so I'm not sure what to put. I tried blank but it gave me an error.

Here's the prompt I see after running holochain -c conductor-config.toml

Using config path: conductor-config.toml
Reading DNA from dist/h-wiki-back.dna.json
Unlocking agent keys:
Unlocking key for agent 'hc-run-agent': 
Reading keystore from progenitor.key
Passphrase: