Topic: Problems with RSS

I have problems with RSS , because my error is http://ps3pirata.com/feed-rss.xml


This page contains the following errors:

error on line 1 at column 6: XML declaration allowed only at the start of the document
Below is a rendering of the page up to the first error.

I installed punbb post feed rss , and work, so the problem is with a original file in the forum  , i am absolutely desesperated
Help

Thanks!