Issue creating sitemap with SL Download component

[hlarocque]

Hi!
I use the Skyline Download Pro component on my website.
http://www.vnskyline.com/skyline-downloads-pro.html
This component is part of my main menu but actually, it doesn't seem to be compatible with XMap. I can't generate the XMap when I include it. Here is the error I have:
XML Parsing Error: no element found
Location: http://www.progexia.com/index.php?option=com_xmap&view=xml&tmpl=component&id=1
Line Number 131, Column 1:

If I look at the html page generated, I have this error:
Fatal error: Class 'SL_DownloadsFactory' not found in /home/progexia/public_html/components/com_sl_downloads/models/documents.php on line 276

Is there any way I can fix it? Thank you!