I am not sure am i posting the right place

How come after i created a sub-domain, when i try to go in this sub-domain, it said bad DNS? http://sc.mewgood.com
I use plesk for the cp. Help please
THX

This is the placeholder for domain sc.mewgood.com. If you see this page after uploading site content you probably have not replaced the index.html file.

i dont understand

oh
i got it
thx

damn why this happen everytime I set a new sub-domain up:(
now it is this
http://forum.mewgood.com
IT said the host was not found
.......
my main is up tough