"Unable to create email: no recipient specified in process step available" when creating an email from an Automation Process

Issue
The following error displays on the Create Email process step when the automation attempts to create the email: 

"Unable to create email: no recipient specified in process step available"

Cause
This has been caused because the Automation did not have a Recipient selected in the step that creates the email.

Solution
Check the step(s) in the Automation and ensure they have a Recipient selected to create the email. Then test that the Automation is running correctly.