Fedora 11 multiple cd install fails, installation repository on disc missing or damaged

[Jonathan Boni]

I'm trying to install fedora 11 using the multiple cd installation and the installer refuses to install if there's no network connection.
sometimes it throws a message saying the repository database is missing or damaged.
 
I did a sha256 sum check on all the images and a data verification after burning the isos with nero.
all the sums are correct and the cds burned with no problems.
also did the cd check with the installer and no problems with the discs.
 
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