The Domain mapping plugin is not working

Hi,

I've installed Domain Mapping, and followed all the steps, including pointing the DNS on the domain server, and switching to dedicated IP on the main blog, but the domain is not pointing to my site.

Main blog: http://www.320studiosnyc.com
Sub Site: http://www.320studiosnyc.com/pmpstudios
Domain trying to redirect: http://www.pmpstudios.com

The main blog domain and the sub blog domain aren't purchased in the same server.