Web Core

I am starting to learn to use web core at a very basic level

I have produced a page that does some calculations'.

However when I upload it to my Web hosting platform I get the following (image attached)

here is the URL

Would this be a webcore issue or the webhosting issue?

many thanks

David Royall

Can you perhaps share a more detailed browser console log?

Thank you Bruno - I have solved the problem, was missing a html file