I hired a guy to redesign my website, and suddenly my Feedburner RSS feed is not working. When you visit the feed I get this message:

XML Parsing Error: XML or text declaration not at start of entity
Location: http://feeds.feedburner.com/presalehub
Line Number 3, Column 1:<?xml version="1.0" encoding="UTF-8"?>
^

As I am not very tech-savvy, I have no idea what this means or how to fix it, and the guy that designed my site is unreachable.

PLEASE HELP!

Thanks guys