<div dir="ltr">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.<div>
<br></div><div>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.</div><div><br></div><div style>
Thanks for the message.</div><div><br></div><div>Robby</div><div><br></div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Fri, Jun 21, 2013 at 1:27 PM, Saad Bashir <span dir="ltr"><<a href="mailto:bashir.saad@gmail.com" target="_blank">bashir.saad@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">I have downloaded the Racket v 5.3.5 (June 2013).<div><br></div><div>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 . </div>
<div><br></div><div><div><div>Welcome to DrRacket, version 5.3.4 [3m].</div><div>Language: Beginning Student [custom]; memory limit: 128 MB.</div><div>Teachpacks: image.ss and image.rkt.</div></div><div><div><font color="#ff0000"><i>namespace-require/constant: assignment disallowed;</i></font></div>
<div><font color="#ff0000"><i> cannot change constant</i></font></div><div><font color="#ff0000"><i> constant: scene+line</i></font></div></div></div><div><font color="#ff0000"><i><br></i></font></div><div><font color="#000000">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:</font></div>
<div><font color="#000000"><br></font></div><div><div><font color="#ff0000"><i>teachpack: the teachpack 'image.ss' was not found</i></font></div><div><font color="#ff0000"><i>> </i></font></div></div>
<div><font color="#ff0000"><i><br></i></font></div><div><font color="#000000">I have tried to download several times but every time the same thing happens.</font></div><div><font color="#000000"><br></font></div>
<div><font color="#000000">Don't know what to do. Please help.</font></div><span class="HOEnZb"><font color="#888888"><div><font color="#000000"><br></font></div><div><font color="#000000">Saad</font></div><div><font color="#ff0000"><i><br>
</i></font></div>
</font></span></div>
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<br></blockquote></div><br></div>