Domain mapping - Problem mapping site to domain

Hi,

I was able to install the domain mapping plugin and now I'm trying to map www,gatinhos.pt to site http://www.macacadas.pt/gatinhos/ . Both domains are hosted on the same server with IP = 80.172.234.25

When I configure the mapping I get an error message that I can't make sense of:

"If you want to redirect a domain you will need to add a DNS "A" record pointing at the IP address of this server: 80.172.234.25"

Both domains are hosted on the same server with IP = 80.172.234.25 and gatinhos.pt is configured as follows:

Name TTL Class Type Record Action
gatinhos.pt. 14400 IN A 80.172.234.25
localhost.gatinhos.pt. 14400 IN A 127.0.0.1
http://www.gatinhos.pt. 14400 IN CNAME gatinhos.pt

On the server folder structure, gatinhos.pt is a subdirectory of public_html.

What should I be doing different?
Thank you for your help.