Inspector then Error in SwaggerHub "Could not render n, see the console"

Hi,

When we create with Inspector the API we always end up with "😱 Could not render n, see the console." in SwaggerHub.
Please, see
https://app.swaggerhub.com/apis/paceval/paceval-service/4.04#/default/post_Demo_

It seems Inspector has an issue with application/json.

Kind regards, Joerg