Installing Fedora8 over network from Suse TFTP server

Hello to all
I want to install fedora8 over network via suse enterprise 10.2 server. I have installed suse enterprise 10.2 on my server & configured dhcp server, tftp server, nfs server. i mounted Fedora dvd & made enry in /etc/export file. Client computer boots from pxeboot, it gets IP address but it gives following message:

“VFS: can not open root device “<NULL>” or unknown-block(253,0)
Kernel panic not syncing: VFS: unable to mount root fs on unknown-block(253,0)”

Can any one help me?

Thanking you.