=>

default-load-handler: cannot open module file
  module path: reader
  path: /home/stchang/plt601/racket/collects/reader/main.rkt
  system error: No such file or directory; errno=2
  context...:
   standard-module-name-resolver
   /home/stchang/plt601/racket/collects/racket/require-transform.rkt:266:2: expand-import
   /home/stchang/plt601/racket/collects/racket/private/reqprov.rkt:487:22
   /home/stchang/plt601/racket/collects/racket/private/reqprov.rkt:483:5
   /home/stchang/plt601/racket/collects/racket/require-transform.rkt:266:2: expand-import
   /home/stchang/plt601/racket/collects/racket/require.rkt:26:3
   /home/stchang/plt601/racket/collects/racket/require-transform.rkt:266:2: expand-import
   try-next
   try-next
   /home/stchang/plt601/racket/collects/racket/private/reqprov.rkt:243:2
   /home/stchang/plt601/racket/collects/syntax/wrap-modbeg.rkt:46:4
   standard-module-name-resolver
   /home/stchang/plt601/pkgs/scribble-pkgs/scribble-lib/scribble/run.rkt:133:24
   /home/stchang/plt601/pkgs/scribble-pkgs/scribble-lib/scribble/run.rkt: [running body]