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kernel panic - not syncing :VFS: unable to mount r...

kernel panic - not syncing :VFS: unable to mount root fs on unknown -block(8,4)
please tell me what this means please.??
is it something to do with lilo? or is it to do with the installation?.
my boot partition is called sda2 and my root partition is sda4, sda3 is swap and sda1 is windows.
all the linux partitions are reiserfs.
one other thing ..when i try to chroot back into my system after trying to boot it, nothing seems to work. ie chroot /mnt/gentoo /bin/bash
bin/bash doesent exist. Do i have to go through the whole install again????