Open Stack

Hi all,
I have ran the OSA playbooks to completion on more than one occasion but recently I'm having an issue I can't figure out so if anyone could shed some light on it it would be much appreciated.
When running "openstack-ansible setup-openstack.yml" I get to the task named "TASK [python_venv_build : Create wheel directory on the build host]" and I get the following error:
fatal: [infra1_gnocchi_container-7c40503c -> infra1_repo_container-017aea8f(xx.xx.xx.xx)]: FAILED! => {"changed": false, "gid": 0, "group": "root", "mode": "0755", "msg": "chown failed: failed to look up user nginx", "owner": "root", "path": "/var/www", "size": 4096, "state": "directory", "uid": 0}

I cannot seem to find anything about this and didn't see this error when running the playbooks previously. Thanks in advance for any suggestions.
Regards,Derek
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