Ceph - Dashboard installation failing on TASK [ceph-grafana : Push dashboards to Grafana]

Issue

• I'm trying to deploy the RHCS Dashboard, but ceph-ansible is failing on this step:

TASK [ceph-grafana : Push dashboards to Grafana] ********************************************************************************
fatal: [cephtest]: FAILED! => {"changed": true, "cmd": ["/usr/libexec/cephmetrics/dashUpdater.py", "-m", "refresh", "-c", "/tmp/dashboard.yml", "-D", "/usr/share/cephmetrics/dashboards"], "delta": "0:00:00.066873", "end": "2017-12-19 16:01:09.998202", "failed": true, "msg": "non-zero return code", "rc": 1, "start": "2017-12-19 16:01:09.931329", "stderr": "Traceback (most recent call last):\n  File \"/usr/libexec/cephmetrics/dashUpdater.py\", line 8, in <module>\n    from requests import get, post, put\nImportError: No module named requests", "stderr_lines": ["Traceback (most recent call last):", "  File \"/usr/libexec/cephmetrics/dashUpdater.py\", line 8, in <module>", "    from requests import get, post, put", "ImportError: No module named requests"], "stdout": "", "stdout_lines": []}
        to retry, use: --limit @/usr/share/cephmetrics-ansible/playbook.retry

PLAY RECAP **********************************************************************************************************************
cephtest                : ok=36   changed=8    unreachable=0    failed=1