Issues in the form_form a story_ type=radio

Dear all,
When I filled in the form the Yes or No section (radio type), I get a error message showed in the image below.
It seems that I have to select “Yes” to submit the form, but as I understood the type=radio, only one “required” is needed for the whole section. So, I suppose if I selected “No”, it should also work. Apparently, it did not. What is going wrong? Thx!
https://www.codecademy.com/courses/learn-html/projects/form-a-story

I don’t think its possible, html forms support some front-end validation

more complex front-end validation would require the use of JavaScript