Uploading File to Nexus 9000 with Ansible Playbook - ansible

Question

Trying to automate file uploading process to the Cisco Nexus 9000 device with Ansible Playbook.
- name: Upload File to Nexus Device
gather_facts: no
hosts: localhost
connection: local
tasks:
- name: Uploading file
nxos_file_copy:
provider:
username: admin
ssh_keyfile: "files/id_rsa"
host: 192.168.0.100
validate_certs: no
transport: cli
local_file: "config.txt"
remote_file: "config.txt"
When running the playbook I am getting following error
The full traceback is:
Traceback (most recent call last):
File "/tmp/ansible_4UEm25/ansible_module_nxos_file_copy.py", line 255, in <module>
main()
File "/tmp/ansible_4UEm25/ansible_module_nxos_file_copy.py", line 245, in main
transfer_file(module, dest)
File "/tmp/ansible_4UEm25/ansible_module_nxos_file_copy.py", line 174, in transfer_file
port=port)
File "/home/user/venv/ansible-cox/local/lib/python2.7/site-packages/paramiko/client.py", line 424, in connect
passphrase,
File "/home/user/venv/ansible-cox/local/lib/python2.7/site-packages/paramiko/client.py", line 714, in _auth
raise saved_exception
paramiko.ssh_exception.PasswordRequiredException: Private key file is encrypted
fatal: [localhost]: FAILED! => {
"changed": false,
"module_stderr": "Traceback (most recent call last):\n File \"/tmp/ansible_4UEm25/ansible_module_nxos_file_copy.py\", line 255, in <module>\n main()\n File \"/tmp/ansible_4UEm25/ansible_module_nxos_file_copy.py\", line 245, in main\n transfer_file(module, dest)\n File \"/tmp/ansible_4UEm25/ansible_module_nxos_file_copy.py\", line 174, in transfer_file\n port=port)\n File \"/home/user/venv/ansible-cox/local/lib/python2.7/site-packages/paramiko/client.py\", line 424, in connect\n passphrase,\n File \"/home/user/venv/ansible-cox/local/lib/python2.7/site-packages/paramiko/client.py\", line 714, in _auth\n raise saved_exception\nparamiko.ssh_exception.PasswordRequiredException: Private key file is encrypted\n",
"module_stdout": "",
"msg": "MODULE FAILURE",
"rc": 1
}
When SSH-ing from local terminal with the same key it works
(ansible) ~/B/c/Ansible on master ⨯ ssh admin#192.168.0.100 -i files/id_rsa
User Access Verification
NX9K#
I am using Ansible 2.5.4 version.
Any help is greatly appreciated!