The content you are trying to view cannot be viewed as JSON when running sample example

Hello,
I am trying to run the example demonstrated in this link: https://www.soapui.org/getting-started/rest-testing/ but i am getting the error:
"The content you are trying to view cannot be viewed as JSON" for the json.

checked the content type and it is text/html ..Should not it be json?

Thanks for advising.