what is rss code to add wp-rss2.php to avoid text display?

I created the rss code for wp-rss2.php, but it displays as html/text. Is there a code line to put above the <rss version=”2.0″> at the top of the page – or somewhere?

you can see the link from the bottom of our page “entries: rss” at https://www.ayurvedahc.com/shakti/

Thank you.