<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><br></div><div>Language -> Clear All Teachpacks </div><div><br></div><div>Language -> Add Teachpack </div><div><br></div><div> see two columns </div><div> choose image from 2e column only </div><div><br></div><div>That's it. </div><div><br></div><div>Thanks for the report; the error message should definitely be more informative -- Matthias</div><div><br></div><div><br></div><br><div><div>On Jun 21, 2013, at 2:27 PM, Saad Bashir wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><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 style=""><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 style=""><font color="#000000"><br></font></div><div style=""><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 style=""><font color="#000000">I have tried to download several times but every time the same thing happens.</font></div><div style=""><font color="#000000"><br></font></div> <div style=""><font color="#000000">Don't know what to do. Please help.</font></div><div style=""><font color="#000000"><br></font></div><div style=""><font color="#000000">Saad</font></div><div><font color="#ff0000"><i><br></i></font></div> </div> ____________________<br>  Racket Users list:<br>  <a href="http://lists.racket-lang.org/users">http://lists.racket-lang.org/users</a><br></blockquote></div><br></body></html>