Error: LOAD cannot open object file

Hi,
I try to load an object file into the Postgres address space with the
command
load 'home/M97/vassilik/protein/phone.o'

and get the following

ERROR: LOAD: could not open file /home/M97/vassilik/protein/phone.o

I think it is because I am not the "postgres" user and the documentation
(Ch 10 Programmer's Guide) says that the Postgres user must be able to
traverse the path and read the object file.

Is that right? If not, what is wrong?
Kostas Vassiliadis