[racket] ufo structure problem

Op 30-3-2012 9:46, Pierpaolo Bernardi schreef:
> Hello Roelof,
>
> On Fri, Mar 30, 2012 at 09:32, Roelof Wobben<r.wobben at 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.
>

Oke, I will do that.

Yes, The error that variable u is not known.

Roelof