[racket] Question about Moby

This program:

#lang racket
(require (planet dyoo/moby:3:9))

gives me this error:

 ..\..\Documents and Settings\Mark\Application
Data\Racket\planet\300\5.0.2\cache\dyoo\js-vm.plt\1\12\private\translate-bytecode-structs.rkt:25:8:
compile: unbound identifier in module in: internal:indirect?


Any idea what's going on?  I'm running version 5.0.2 of Dr Racket on Windows XP.

Thanks,

Mark