[plt-scheme] How to load a file.

Hi,
 I want to use some functions of one file in another file.
 So I use load procedure as:

#lang r5rs
(load "sec-3.3.2.scm")

But when I try to use function from that file error is coming as
"unbound identifier in module"

I am using version 4.1.3
Am I doing it wrong? Please help.
-- 
Thanks and Regards
Vinay Sachdev
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