problem with yum
 

i have problem when i tried to perform update from yum command then it gave that base url not found.Then i searched all files in /etc/yum/repos.d
over there all abse url where commented.I removed the # from all base url and set enabled =1.After that running yum it is showing

[root@localhost ~]# yum update
Loading "skip-broken" plugin
Loading "fastestmirror" plugin
Loading "installonlyn" plugin
Setting up Update Process
Setting up repositories
http://download.fedora.redhat.com/pu...ta/repomd.xml: [Errno 14] HTTP Error 404: Date: Thu, 23 Apr 2009 20:36:52 GMT
Server: Apache
Content-Length: 259
Content-Type: text/html; charset=iso-8859-1

Trying other mirror.
Error: Cannot open/read repomd.xml file for repository: extras-development-source


how to solve this error

There is no more download.fedora.redhat.com you need to change that to:

mirrors.fedoraproject.org