Gives ERROR message when tryong to map my site.

[imanager]

Mapped one of our sites, [ External links are visible to forum administrators only ] and worked fine. Tryed to map another one, "www.debarth.info," and we only get, "An error occured," without any details. We also tryed just "debarth.info" and got two pages mapped. We have over thirty pages on that site to map. What are we doing wrong? 

[XML-Sitemaps Support]

Hello,

I'm getting "Directory Listing Denied" error for this URL.