Hello Roelof,

On Fri, Mar 30, 2012 at 09:32, Roelof Wobben <r.wob...@home.nl> wrote:

> (define (show-ufo ufo)
>  (place-image BLU (ufo-loc u) MTS))
>
> But still I can't get the show-ufo work.

Check carefully the name of your variables!

Doesn't DrRacket give you an explicative error message in this case?

P.

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