A feed could not be found at… Commentluv Error

Hi,

When I try to post comment on sites with CommentLuv, sometimes there is no problem with my feed and CommentLuv shows my recent posts. But on some blogs I get this error: “A feed could not be found at …” Though I see other people have no problem on the same blog.

Here is my site:
http://www.nailyener.com/

Here is a sample site where CommentLuv works for me:
http://www.murlu.com/

And here is a sample site where CommentLuv doesn’t work for me:
http://blazingminds.co.uk/

So, what could be the problem?

Nail