Cannot edit the cross validation rule error message

Summary:

When i am trying to modify the cross validation rule via Tasks: Manage cross-validation rule, I found that i cannot edit the error message.

It is grey out. Is there a way to edit the error message?

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):