In google search console, what does this mean?
(Your Sitemap appears to be an HTML page. Please use a supported sitemap format instead.)
The line above in brackets...I do not know enough to understand what it means?
I don't know if I should worry about it or not? It shows as an error? Why?
All of my websites are most likely the same and all are siterubix.com websites.
Are my whole websites/ pages and posts HTML?
What does it have to be to satisfy Google?
Do I need to change something at all?