source of the "all packages are currently up to date" bug?

[Timothy Ryan Bierer]

I was doing some fooling around and stumbled upon this:

[root at root]# yum upgrade
Gathering header information file(s) from server(s)
Server: Fedora Core 1.90 - Development Tree
Finding updated packages
Downloading needed headers
retrygrab() failed for:
  
http://download.fedora.redhat.com/pub/fedora/linux/core/development/i386//headers/system-config-users-0-1.2.9-1.1.noarch.hdr
  Executing failover method
failover: out of servers to try
Error getting file 
http://download.fedora.redhat.com/pub/fedora/linux/core/development/i386//headers/system-config-users-0-1.2.9-1.1.noarch.hdr
[Errno 6] ERROR: Url Return no Content-Length  - something is wrong

Would this be the cause of the bug?