I0409 16:11:15.818848       1 serving.go:386] Generated self-signed cert in-memory
E0409 16:11:15.820833       1 run.go:72] "command failed" err="failed to create listener: failed to listen on 0.0.0.0:10257: listen tcp 0.0.0.0:10257: bind: address already in use"