LILO

[manux]

i have two linux dist. installed Debian and redhat. i wanted to add Debian partition to my lilo.conf file so i can boot debian from the harddrive. when i do i get a message that the first sector of debian's linux partition doesn't have a valid boot signature. i tried to do the same thing from debian and it gave me the same error that RH partition doesn't have a valid boot sector.
how do i fix this?