RSS feed prbolem

Hello!

I started out having some issue with my feed today. For some reason, Feedburner is showing a different feed (another site which has very same name with mine). So I deleted the old feedburner and tried to add a new one.

Now, it says my feed is invalid. This is the part where I am puzzled.

WP gives me the feed as: passiveincomeonline.net/feed

Typing this or the website address in feedburner will lead to invalid. So, what is wrong?

How to solve this?

Please advise and thank you.