Please find content of my playbook.yml file as below. I am getting fetal error 
for this installation.

hosts: openwisp2
become: "{{ become | default('yes') }}"
roles:
openwisp.openwisp2
vars:
postfix_myhostname: "strix-Sun-Fire-X4100-Server"
openwisp2_network_topology: true
openwisp2_controller_pip: openwisp-controller==0.2.3
openwisp2_python: python2.7

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