During the advanced installation, there is this error message ERROR! 'vars_files' is not a valid attribute for a PlaybookInclude

Issue

• After I have configured Ansible (file /etc/ansible/hosts), I run the following playbook and there is an error message:

$ ansible-playbook /usr/share/ansible/openshift-ansible/playbooks/byo/config.yml
ERROR! 'vars_files' is not a valid attribute for a PlaybookInclude

The error appears to have been in '/usr/share/ansible/openshift-ansible/playbooks/byo/openshift-cluster/config.yml': line 2, column 3, but may
be elsewhere in the file depending on the exact syntax problem.

The offending line appears to be:

- include: ../../common/openshift-cluster/config.yml
  ^ here






Here it is my ansible file:
# Create an OSEv3 group that contains the masters, nodes, and etcd groups
[OSEv3:children]
masters
nodes
etcd
lb

# Set variables common for all OSEv3 hosts
[OSEv3:vars]

# SSH user, this user should allow ssh based auth without requiring a password
ansible_ssh_user=user

# If ansible_ssh_user is not root, ansible_sudo must be set to true
ansible_sudo=true
deployment_type=openshift-enterprise

osm_cluster_network_cidr=x.x.0.0/16
osm_default_subdomain=example.com


openshift_node_kubelet_args={'minimum-container-ttl-duration': ['10s'],'maximum-dead-containers-per-container': ['2'],'maximum-dead-containers': ['10'],'image-gc-high-threshold': ['90'],'image-gc-low-threshold': ['80']}

# uncomment the following to enable htpasswd authentication; defaultsto DenyAllPasswordIdentityProvider
openshift_master_identity_providers=[{'name': 'htpasswd_auth','login': 'true', 'challenge': 'true', 'kind':'HTPasswdPasswordIdentityProvider', 'filename':'/etc/origin/htpasswd'}]

# Native high availability cluster method with optional load balancer.
# # If no lb group is defined, the installer assumes that a load balancer has
# # been preconfigured. For installation the value of
# # openshift_master_cluster_hostname must resolve to the load balancer
# # or to one or all of the masters defined in the inventory if no load
# # balancer is present.
openshift_master_cluster_method=native
openshift_master_cluster_hostname=vm-openshift-cluster.example.com
openshift_master_cluster_public_hostname=vm-openshift-cluster.example.com


# override the default controller lease ttl
#osm_controller_lease_ttl=30

# host group for masters
[masters]
host3.internal.com openshift_public_hostname=master1.example.com
host4.internal.com openshift_public_hostname=master2.example.com

# host group for etcd
[etcd]
host3.internal.com openshift_public_hostname=master1.example.com
host4.internal.com openshift_public_hostname=master2.example.com

# host group for lb
[lb]
host2.internal.com openshift_public_hostname=loadbalancer.example.com

# host group for nodes, includes region info
[nodes]
host3.internal.com openshift_node_labels="{'region': 'primary', 'zone': 'north'}" openshift_public_hostname=master1.example.com
host4.internal.com openshift_node_labels="{'region': 'primary', 'zone': 'south'}" openshift_public_hostname=master2.example.com