[Implement http-01 challenge files]

As I was following through the tutorial and got the error while executing the task for implement http-01 challenge files.

fatal: [1.2.3.4]: FAILED! => {“msg”: “The task includes an option with an undefined variable. The error was: ‘dict object’ has no attribute ‘domain’\n\nThe error appears to be in ‘/home/ubuntu/ansible-playbooks/letsencrypt-issue.yml’: line 72, column 7, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n\n - name: "Implement http-01 challenge files"\n ^ here\n”}