Hello everyone, I fixed it after talking to Nana (man he's a cool guy!!) If you get this error message above, here's what happened to me and how I fixed it.
On my dedicated server I had set up several sub-domains domains and an addon domain onto the primary domain of the server. However I had not changed the nameservers for any of the subdomains, only the primary and the addon domain.
I was trying to install Prosper onto the only addon domain on the server. But for some weird reason I was getting the above error message. When we navigated to the Prosper202 installed addon domain, it listed the index with all the subdomains on the server. And when I clicked on the Prosper's addon domain in the list, I got the error message above.
However Nana noticed that the addon domain where I installed Prosper had no extension (.net .info .com) like all the rest of the domains.
So when I went into the cpanel and saw the addon domain was in fact an addon. But I noticed that all the domains but one were setup as subdomains. And I thought someone had set them up to be all addon domains.
When I deleted all the subdomains and navigated to the addon domain with Prosper installed everything worked correctly.
If you ever want to meet some of the coolest guys I've met in a long time, get to a San Francisco for one of the tracking202 meetups. I guarantee you will enjoy it, and learn tons.
Nana, thanks, I appreciate you, Jim