Feedburner is not identifying my feed source

[Greenpillot]

Here is my feed source https://www.posturepro.net/posturology-blog/


Here is what is being recognizes: https://www.posturepro.net/feed

When I click on next i get an error message..

The URL does not appear to reference a valid XML file. We encountered the following problem: Error on line 1: The processing instruction target matching "[xX][mM][lL]" is not allowed.

Anyone can help?

[Matti nescio]

From https://validator.w3.org/feed/check.cgi?url=http://www.posturepro.net/feed/ 

, and from viewing the source of http://www.posturepro.net/feed/ , you can 

see that the feed XML does not start with <?xml as it should, but there is blank space before it. 

[kosit la-orngsri]

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