Why does Ansible show “ERROR! no action detected in task” error?

Question

Ansible shows an error:

ERROR! no action detected in task. This often indicates a misspelled module name, or incorrect module path.

Answer 1

For me the problem occurred with "systemd" module. Turned out that my ansible --version was 2.0.0.2 and module was first introduced in version 2.2. Updating my ansible to latest version fixed the problem.

playbook.yaml

- name: "Enable and start docker service and ensure it's not masked"
  systemd:
    name: docker
    state: started
    enabled: yes
    masked: no

Error

ERROR! no action detected in task
etc..   
etc..
etc..

- name: "Enable and start docker service and ensure it's not masked"
  ^ here