Anyone here good with Ansible? Trying to connect to some cisco switches and getting errors

Wrote my first playbook and when trying to run it, I am getting some errors.....

Fatal: [x.x.x.x]: FAILED!=>{"ansible_facts": ["discovered_interpreter_python": "/usr/bin/python"}, "changed": false, "msg": "Failed to authenticate: Private key file is encrypted"}

Can anyone point me in the right direction on what I need to do? I assume its something with the RSA key, just not sure how to fix it, not having much luck searching on google.