Routing Error - Improper Cost Configuration

Summary:

When i tried to schedule an activity from non scheduled pool using routing i have received an error - Improper cost configuration. Could you please help to understand what does it mean by improper cost configuration and what can we do to avoid it.

Content (please ensure you mask any confidential information):

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):