Contrail Ansible Deployer fails in the configure_instances stage

Traceback from the ansible.log file:

018-04-18 22:55:16,502 p=1528 u=root | ok: [10.0.0.5]
2018-04-18 22:55:16,544 p=1528 u=root | TASK [configure_instances : set vrouter data] ************************************************************************************************************************************
2018-04-18 22:55:16,592 p=1528 u=root | fatal: [10.0.0.10]: FAILED! => {"msg": "The task includes an option with an undefined variable. The error was: 'dict object' has no attribute 'vrouter'\n\nThe error appears to have been in '/root/contrail-ansible-deployer/playbooks/roles/configure_instances/tasks/install_software.yml': line 6, 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: set vrouter data\n ^ here\n"}
2018-04-18 22:55:16,635 p=1528 u=root | fatal: [10.0.0.12]: FAILED! => {"msg": "The task includes an option with an undefined variable. The error was: 'dict object' has no attribute 'vrouter'\n\nThe error appears to have been in '/root/contrail-ansible-deployer/playbooks/roles/configure_instances/tasks/install_software.yml': line 6, 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: set vrouter data\n ^ here\n"}
2018-04-18 22:55:16,722 p=1528 u=root | ok: [10.0.0.7]
2018-04-18 22:55:16,765 p=1528 u=root | fatal: [10.0.0.4]: FAILED! => {"msg": "The task includes an option with an undefined variable. The error was: 'dict object' has no attribute 'vrouter'\n\nThe error appears to have been in '/root/contrail-ansible-deployer/playbooks/roles/configure_instances/tasks/install_software.yml': line 6, 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: set vrouter data\n ^ here\n"}
2018-04-18 22:55:16,809 p=1528 u=root | ok: [10.30.0.6]
2018-04-18 22:55:16,852 p=1528 u=root | ok: [10.20.0.6]
2018-04-18 22:55:16,909 p=1528 u=root | ok: [10.30.0.5]
2018-04-18 22:55:16,956 p=1528 u=root | ok: [10.20.0.5]
2018-04-18 22:55:17,005 p=1528 u=root | ok: [10.0.0.8]
2018-04-18 22:55:17,071 p=1528 u=root | fatal: [10.0.0.11]: FAILED! => {"msg": "The task includes an option with an undefined variable. The error was: 'dict object' has no attribute 'vrouter'\n\nThe error appears to have been in '/root/contrail-ansible-deployer/playbooks/roles/configure_instances/tasks/install_software.yml': line 6, 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: set vrouter data\n ^ here\n"}
2018-04-18 22:55:17,139 p=1528 u=root | fatal: [10.0.0.9]: FAILED! => {"msg": "The task includes an option with an undefined variable. The error was: 'dict object' has no attribute 'vrouter'\n\nThe error appears to have been in '/root/contrail-ansible-deployer/playbooks/roles/configure_instances/tasks/install_software.yml': line 6, 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: set vrouter data\n ^ here\n"}
2018-04-18 22:55:17,172 p=1528 u=root | ok: [10.0.0.6]
2018-04-18 22:55:17,177 p=1528 u=root | fatal: [10.0.0.5]: FAILED! => {"msg": "The task includes an option with an undefined variable. The error was: 'dict object' has no attribute 'vrouter'\n\nThe error appears to have been in '/root/contrail-ansible-deployer/playbooks/roles/configure_instances/tasks/install_software.yml': line 6, 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: set vrouter data\n ^ here\n"}
2018-04-18 22:55:17,207 p=1528 u=root | TASK [configure_instances : debug] ***********************************************************************************************************************************************
2018-04-18 22:55:17,314 p=1528 u=root | ok: [10.0.0.7] => {