Error message if all the required questions are not completed

Summary:

Error message if all the required questions are not completed

Content (please ensure you mask any confidential information):

The requirement is that the performer should get an error message at the top of the page in case he misses to answer any of the required questions. Is that possible?

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

25B

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