In some circumstances, a Tasklist Automator can become invalid. This is indicated by the color of the Automator, once you have created it.
A valid Automator appears grey, and will trigger without any issues.
If your Automator displays a warning in orange, it indicates that the scenario is not ideal but will still work.
Example: The Automator will assign a section of tasks to a job role, rather than to an individual team member
If you are unsure why the warning is displayed, open the Automator to reveal the cause of the warning and a suggested solution.
A red warning indicates that an Automator is invalid, and will not work.
Example: If you move a section of tasks to the top, containing an Automator to change the assignee when the tasks above move into the status of 'Completed', is renders that Automator impossible.