[plt-scheme] plt scheme 4.01 (linux) - Can't create a gui executable; mzc unable to locate MrEd

Hey all,

version 4.01
Linux (Ubuntu) Installed using the install script from the PLT website

I'm trying to create an executable from some sample source code I
found on the web.

The command I am using is as follows:

mzc --gui-exe hello hello.scm

This produces the following error:

create-embedding-executable: can't find MrEd executable for variant 3m
 === context ===
/usr/lib/plt/collects/compiler/embed-unit.ss:65:4: find-exe
core

Similar errors revealed when searching for an answer suggested this
was a bug with no work around (though these where a couple of years
old and for different platforms). Is this the case here?

The following is the code I am trying to compile.

;;;begin hello.scm
(module hello ; the module name
  mzscheme ; initial syntax and variable bindings
  (require (lib "mred.ss" "mred")
      (lib "class.ss"))

  ;;Make a frame by instantiating
  ;;the frame% class
  (define frame
       (instantiate frame% ("Hello world")))

  ;;Make a static text message in the frame
  (define msg
       (instantiate message%
         ("No events so far..." frame)))

  ;; Make a button in the frame
  ;;(using keyword-based arguments)
  (instantiate button% ()
    (label "Click Me")
    (parent frame)
    ;; Callback procedure for a button click
    (callback (lambda (button event)
       (send msg set-label "Button click"))))

  ;; Show the frame by calling its show method
  (send frame show #t))
;;;end

Thanks for you time :)