Rss on post page

can you supply an example?

I loaded a stamp of the problem that I’ve make some time ago here:
https://www.atuttonet.it/feedProblem.jpg

It’s a random problem that unfortunally You can’t reproduce in a specific way ??

I have never seen this
you can’t show a working example for us to play with?

Well, you can try in this blog (which is one of my blog where it happens often):
https://casa.atuttonet.it
You can try to navigate along the site, inside post page and out (I tried with firefox,IE,safari,chrome, in every browser this error comes) and it magically appears… ??
I have no idea if it’s a server question or wordpress error, it happens on every clean installation that i made!