Current master build failing in ansible command

[chetanmeh]

Current master build is failing with following error

fatal: [controller0]: FAILED! => {"failed": true, "msg": "the field 'args' has an invalid value, which appears to include a variable that is undefined. The error was: {u'replicationFactor': u\"{{ kafka_replicationFactor | default((groups['kafkas']|length)|int) }}\", u'version': u'0.11.0.1', u'port': 9092, u'heap': u\"{{ kafka_heap | default('1g') }}\", u'ras': {u'port': 8093}}: 'dict object' has no attribute 'kafkas'\n\nThe error appears to have been in '/home/travis/build/apache/openwhisk/ansible/roles/controller/tasks/deploy.yml': line 77, column 3, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n\n- name: (re)start controller\n  ^ here\n"}