RHCS 2.5 cluster Deployment using Ansisble

Hi,

during the deployment, below error is reported :
TASK [ceph-mon : ceph monitor mkfs with keyring] *************************************************************************************************************
fatal: [mon1-ceph-eaa]: FAILED! => {"changed": true, "cmd": ["ceph-mon", "--cluster", "ceph", "--setuser", "ceph", "--setgroup", "ceph", "--mkfs", "-i", "mon1-ceph-eaa", "--fsid", "d64adc8a-b4b5-4c4d-9709-d4cd69badb45", "--keyring", "/var/lib/ceph/tmp/keyring.mon.mon1-ceph-eaa"], "delta": "0:00:00.016126", "end": "2018-05-28 14:37:59.174141", "msg": "non-zero return code", "rc": 1, "start": "2018-05-28 14:37:59.158015", "stderr": "2018-05-28 14:37:59.173279 7ff9ccd5a780 -1 unable to find any IP address in networks: 10.21.231.0/26", "stderr_lines": ["2018-05-28 14:37:59.173279 7ff9ccd5a780 -1 unable to find any IP address in networks: 10.21.231.0/26"], "stdout": "", "stdout_lines": []}

But the IP address is present and public network is correctly configured and all are reachable.