[plt-scheme] Stand alone executable and sxml

I am unable to create the folllowing stand-alone executable:


(module a-module mzscheme
  (require (planet "sxml.ss" ("lizorkin" "sxml.plt" 1 2))))

>mzc --exe a-module.exe a-module.ss

mzc version 301, Copyright (c) 2004-2005 PLT Scheme Inc.
cadr: expects argument of type <cadrable value>; given #f

This is on windows, v301

Any ideas?

-pp
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