<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>