i'm having an issue with my debops project..

i went to provision a new host today and i'm getting this error when any of my roles call docker_image tasks..

fatal: [venue419.mgmt.union.up]: FAILED! => {"changed": false, "msg": "Failed to import docker or docker-py - No module named requests.exceptions. Try `pip install docker` or `pip install docker-py` (Python 2.6)"}

none of my existing hosts experience this error.. just the newest one..

any suggestions around how to resolve this?