Subdomain in multisite not propagating right.

I recently setup another multisite network (my second). I just added my first subdomain. I have a wildcard subdomain set up as instructed, but I get an error when I try to log into the subdomain's dashboard and a hosting message saying there's no content when I visit the subdomain url?!

When I did this before, the subdomain used the WordPress install from the main site... I thought.

Should I need a separate WordPress install for the subdomain?