[plt-scheme] r6rs - import difficulties

In r6rs mode i can't get my libraries to import.

I tried adding the current directory to the collection paths. I get the 
following error -
import: cannot find suitable library installed (exception: 
collection-path: collection not found: "hello" in any of: <list of paths>

version: 4.2.1.4-svn29jul2009

The two files are:
test-hello.ss
#!r6rs
(import (hello))

hello.ss
#!r6rs
(library (hello)
  (export hello-world)
  (import (rnrs base)
          (rnrs io simple))
  (define (hello-world)
    (display "Hello World")
    (newline)))