'ansible.utils.unsafe_proxy.AnsibleUnsafeText object' has no attribute 'stdout'

Action
$ ansible-playbook -i /etc/ansible/hosts /etc/ansible/example.yml -v

Error
'ansible.utils.unsafe_proxy.AnsibleUnsafeText object' has no attribute 'stdout'

Solution
Use the standard output of the variable before setting it as a fact

e.g.

- name: debug

  debug:

   msg: "Hello, {{ my_variable.stdout }}!"

- name: set fact the variable

  set_fact:

    fact_my_variable: "{{ my_variable.stdout }}"