$ ANSIBLE_STDOUT_CALLBACK=debug ansible-playbook -i test01.lxc, -v tests/deploy.yml
Using /home/travis/build/lae/ansible-role-travis-lxc/ansible.cfg as config file
ERROR! Unexpected Exception, this is probably a bug: 'sort_order'
to see the full traceback, use -vvv
build log: https://travis-ci.org/lae/ansible-role-travis-lxc/jobs/357855815
Issue already reported at https://github.com/ansible/ansible/issues/37839