GRUB : could not find filesystem '/dev/root'

Hello,
I'm using Fedora Core-6 and installed Core-7 on a third hard disk
but receive the following error when booting on it :
(note: first+second disks are RAID1+LVM,  third disk is also under LVM)

..
found volume group VolGroup02 ..etc..
mount: could not find filesystem '/dev/root'
..

Please see Fedora Core-7' label hereafter. 
I'm using LVM and have the following grub.conf:

#boot=/dev/mapper/isw_cfaabdceig_RAIDv0
default=0
splashimage=(hd0,0)/grub/splash.xpm.gz

title Fedora Core (2.6.19-1.2911.fc6)
        root (hd0,0)
        kernel /vmlinuz-2.6.19-1.2911.fc6 ro root=/dev/VolGroup00/LogVol00 
rhgb quiet
        initrd /initrd-2.6.19-1.2911.fc6.img

title Fedora Core (2.6.18-1.2798.fc6)
        root (hd0,0)
        kernel /vmlinuz-2.6.18-1.2798.fc6 ro root=/dev/VolGroup00/LogVol00 
rhgb quiet
        initrd /initrd-2.6.18-1.2798.fc6.img

# ---> error hereafter
title Fedora Core-7
        root (hd2,0)
        kernel /vmlinuz-2.6.20-1.2949.fc7 ro 	
root=(hd2,0)/dev/VolGroup02/LogVol00 rhgb quiet
        initrd /initrd-2.6.20-1.2949.fc7.img


Thanks for any clue.
Bye,
Bruno