The resource agent was instructed to execute an action that the agent does not implement.

Not all resource agent actions are mandatory. promote, demote, migrate_to, migrate_from, and notify, are all optional actions which the resource agent may or may not implement. When a non-stateful resource agent is misconfigured as a master/slave resource, for example, then the resource agent should alert the user about this misconfiguration by returning OCF_ERR_UNIMPLEMENTED on the promote and demote actions.