yum error

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http://forums.fedoraforum.org – whenever I use this comand "yum install ......", i get this error: Loading "installonlyn" plugin Setting up Install Process Setting up repositories Error: Cannot find a valid baseurl for repo: extras can anyone help me, I'm new in Linux OS I'm using a Fedora Core 6, I tried to instal a Fedora 12, but I got an error, the installer couldn't find an image "install.img" I downloaded the fedora image from this torrent http://torrent.fedoraproject.org/tor...86-DVD.torrent and I wrote this image on a DVD I don't understand what image is looking the installer If anyone can help me, I'm waiting an answer thanks a lot (HowTos)