my node is installed by ovirt-node-ng-installer-ovirt-4.2-2018021412.iso,  and 
I deploy hosted-engine, # hosted-engine --deploy

[ INFO  ] changed: [localhost][ INFO  ] TASK [Clean /etc/hosts for the engine 
VM][ INFO  ] changed: [localhost][ INFO  ] TASK [Copy /etc/hosts back to the 
engine VM][ INFO  ] changed: [localhost][ INFO  ] TASK [Clean /etc/hosts on the 
host][ ERROR ] fatal: [localhost]: FAILED! => {"msg": "The task includes an 
option with an undefined variable. The error was: list object has no element 
0\n\nThe error appears to have been in 
'/usr/share/ovirt-hosted-engine-setup/ansible/create_target_vm.yml': line 265, 
column 5, but may\nbe elsewhere in the file depending on the exact syntax 
problem.\n\nThe offending line appears to be:\n\n    tags: [ 
'skip_ansible_lint' ]\n  - name: Clean /etc/hosts on the host\n    ^ 
here\n\nexception type: <class 
'ansible.errors.AnsibleUndefinedVariable'>\nexception: list object has no 
element 0"}[ ERROR ] Failed to execute stage 'Closing up': Failed executing 
ansible-playbook[ INFO  ] Stage: Clean up[ INFO  ] Cleaning temporary 
resources[ INFO  ] TASK [Gathering Facts][ INFO  ] ok: [localhost][ INFO  ] 
TASK [Remove local vm dir][ INFO  ] changed: [localhost][ INFO  ] Generating 
answer file 
'/var/lib/ovirt-hosted-engine-setup/answers/answers-20180409164100.conf'[ INFO  
] Stage: Pre-termination[ INFO  ] Stage: Termination[ ERROR ] Hosted Engine 
deployment failed: please check the logs for the issue, fix accordingly or 
re-deploy from scratch.          Log file is located at 
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