Re: error :line 1, column 2: XML parsing error: <unknown>:1:2: xml ......

The error I'm experiencing appears both with
http:validator.w3.org/feed/ and
http://feedvalidator.org.

First I tried with  http:validator.w3.org/feed/
and then, after reading your mail I tried
http://feedvalidator.org with the same result.

The address of my rss page is:
http://www.sparavigna-video-graphic.com/Videoplace/media.xml.
What is really strange today is that I do not really recognize any mistake in my very simple code.
Thank you very much for your answer.
Best regards
This is the error report

Sorry
This feed does not validate.

  a.. line 1, column 2: XML parsing error: <unknown>:1:2: xml declaration not at start of external entity [help]

  <?xml version="1.0" encoding="ISO-8859-1" ?>   ^Source: http://www.sparavigna-video-graphic.com/Videoplace/media.xml