Why Ansible Tower Setup Is Failing At The Task `[nginx : start nginx and configure to startup automatically]`?

Issue

When running setup.sh for installation of Ansible Tower, the task fails as below.

fatal: [localhost]: FAILED! => {"changed": false, "msg": "Unable to restart service nginx: Job for nginx.service failed because the control process exited with error code. See \"systemctl status nginx.service\" and \"journalctl -xe\" for details.\n"}