Invalid RSS feed link

I’m getting this error when I create the RSS feed link:
"RSS feed is invalid. Some of the title or item fields are empty in the resulting RSS feed.”
As I checked, all the item fields are NOT empty. I followed the Webflow University lessons to create the link.

RO link: Webflow -

RSS feed link:

Can anyone help me, please?
I saw that some links in other posts are fixed now.

Thank you!

Here is my public share link: LINK
(how to access public share link)