tasks:
  - name: add a new disk on guest vm
    vmware_guest:
      hostname: "{{ vcenter_hostname }}"
      user: "{{ vcenter_username }}"
      password: "{{ vcenter_password }}"
      datacenter: "{{ vcenter_datacenter }}"
      cluster: "{{ vcenter_cluster }}"
      guest_id: "rhel7_64Guest"
      validate_certs: False
      state: present
      name: "{{ ansible_nodename }}"
      disk:
      - size_gb: 32G
        autoselect_datastore: True
    delegate_to: localhost


  But I have this message:

  fatal: [servername -> localhost]: FAILED! => {
    "changed": false,
    "invocation": {
        "module_args": {
            "annotation": null,
            "cluster": "cluster",
            "customization": {},
            "customvalues": [],
            "datacenter": "datacenter",
            "disk": [
                {
                    "autoselect_datastore": true,
                    "size_gb": "32G"
                }
            ],
            "esxi_hostname": null,
            "folder": "/vm",
            "force": false,
            "guest_id": "rhel7_64Guest",
            "hardware": {},
            "hostname": "vcenter.domain",
            "is_template": false,
            "linked_clone": false,
            "name": "servername",
            "name_match": "first",
            "networks": [],
            "password": "VALUE_SPECIFIED_IN_NO_LOG_PARAMETER",
            "resource_pool": null,
            "snapshot_src": null,
            "state": "present",
            "template": null,
            "user": "VSPHERE.LOCAL\\username",
            "username": "VSPHERE.LOCAL\\username",
            "uuid": null,
            "validate_certs": false,
            "wait_for_ip_address": false
        }
    },
    "msg": "hardware.num_cpus attribute is mandatory for VM creation"
}
	to retry, use: --limit @/home/svc_ansible/Ansible/SAQ/Base/playbooks/preparation_webmethod10.retry