Back to getting this to work. Kind of dead in the water with this error: /Users/pitosalas/.rbenv/versions/2.7.2/lib/ruby/gems/2.7.0/gems/redis-4.2.5/lib/redis/client.rb:367:in `rescue in establish_connection': Error connecting to Redis on localhost:6379 (Errno::ECONNREFUSED) (Redis::CannotConnectError)

What causes Redis to run? I didn't see any step that required me to do that. Is that what's wrong?