domain mappting with sub directory

I just recently installed the domain mapping plugin and ran into a slight complication. I have the correct settings for sunrise.php as well as being pointed to the correct server. When I mapped my first domain, I was trying to map to

I noticed as I was mapping it, i typed in the domain and pressed "add". It then changed it to "" which points to no where.

My admin for that site is now accessible so any feedback would be appreciated!