Need help setting up ansible-playbook hosts.ini configuration

Hi Team, Iam facing the below issue while configuring ansible-playbook -i hosts.ini env-check.yaml

Error: fatal: [node1]: UNREACHABLE! => {“changed”: false, “msg”: “Failed to connect to the host via ssh: root@ Permission denied (publickey,password).”, “unreachable”: true}
Iam following the documents and need a bit of clarification.
FYI… id_rsa private key obs.pem file correct. value 400
can you please help me to resolve this issue

issue is resolved… (private key permission issue)