I think I understand what happened here: you have used an earlier version of DrRacket where the teachpacks had slightly different names than they do now and the old preferences confused DrRacket to the point that you have to remove the old teachpack before it will run programs.
I have changed DrRacket so that it still prints the same error message, but now also runs your program. Hopefully this will be less confusing for others that follow in your footsteps. Thanks for the message. Robby On Fri, Jun 21, 2013 at 1:27 PM, Saad Bashir <bashir.s...@gmail.com> wrote: > I have downloaded the Racket v 5.3.5 (June 2013). > > However when I open it to program (I am a beginner and using BSL to study > HtDP). the following message is seen in the operation area in red as pasted > below . > > Welcome to DrRacket, version 5.3.4 [3m]. > Language: Beginning Student [custom]; memory limit: 128 MB. > Teachpacks: image.ss and image.rkt. > *namespace-require/constant: assignment disallowed;* > * cannot change constant* > * constant: scene+line* > * > * > The problem the language does not function. When I write even a simple > line like (+ 3 2) in the definition area, and click run the following > message appears rather than the result: > > *teachpack: the teachpack 'image.ss' was not found* > *> * > * > * > I have tried to download several times but every time the same thing > happens. > > Don't know what to do. Please help. > > Saad > * > * > > ____________________ > Racket Users list: > http://lists.racket-lang.org/users > >
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