Sitemap empty

I use this plugin for my website Id theft protection

I have installed the plugin, I use have a robots.txt file, not a virtual robots txt.
If I try to display my sitmap at http://idtheftdefense.net/sitemap.xml

I got this error:

This page contains the following errors:
error on line 2 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.

• This topic was modified 7 years ago by idtheftprotection.

The page I need help with: [log in to see the link]