Error downloading wbt-virtualmin-nuvola-1.250-1.noarch.rpm

I am attempting to install Virtualmin for the first time on a Fedora Core 4 (Pentium 4) system. It fails with this:

Error Downloading Packages:
wbt-virtualmin-nuvola - 1.250-1.noarch: failure: wbt-virtualmin-nuvola-1.250-1.noarch.rpm from virtualmin-universal: [Errno 256] No more mirrors to try.

Status: 
Closed (fixed)