Today at night when I was playing with my post and comment feeds I found that my post feeds were not redirecting towards my feedburner feeds and this problem just stucked in my mind, and I found the silly but working solution of this problem.
How to fix Feed could not be found at Error in blogger:
Just follow the simple steps bellow
1. Login to your blogger account. then click on settings in dashboard, click on site feed.
2. check that you have entered your correct feedburner feeds url in Post Feed Redirect URL slot.
3. In my case I missed http://
After correcting url as shown in image bellow,
The problem got solved, as you can see in bellow image.
Though the above error was very silly, but when everything goes wrong sometimes such error occurs, Just search in google you will find this question everywhere unanswered. :)