Group root not found

[milaw]

I'm running on CoreOS
I ran Docker with go to install libsecret (from git)
Vault server up and works

sudo /tmp/bin/docker-volume-libsecret --addr ${VAULT_ADDR} --backend vault --store-opt token=${VAULT_TOKEN}
INFO[0000] docker-volume-libsecret v0.1.0 (HEAD)
DEBU[0000] initializing secret driver: backend=vault addr=http://127.0.0.1:8200
DEBU[0000] opts: map[token:xxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx]
DEBU[0000] backend: vault
FATA[0000] Group root not found

Any suggestion ?