strange error with lilo: "open /tmp/dev.0: No such device"?

[Jieming Wang]

I am having troubles with lilo. When I run lilo (with or without options), 
it gives errors:

open /tmp/dev.0: No such device

I have no clues.

Here is what i did:
I first installed OS (Redhat 6.2) on an IDE drive, create RAID1 on 2 extra 
SCSI disks, and mounted. I copied the root files (/) onto the new raid1 
device /dev/md0. I run lilo (to create boot sector on the SCSI disks). 
Everything seems ok. But after boot up, I can't run lilo anymore (got the 
above errors).

Thanks in advance.

JW