I0429 21:57:32.087112       1 serving.go:386] Generated self-signed cert in-memory
E0429 21:57:32.088598       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"