Hi Elena, You can also remove the teachpack from column one. It is, however, simple enough for students to only add the teachpack in column 2. Once you add a teachpack, it remains added until it is removed. My first year students run DrRacket without removing the teachpack all semester.
Marco On Sep 6, 2013 10:42 PM, "Elena Machkasova" <ele...@morris.umn.edu> wrote: > Good evening, > > this may've come up before, but I looked through the last few messages and > did a bit of searching, and couldn't find anything about this problem. My > apologies if this is already a known issue. > > When DrRacket is installed, it comes with 3 pre-installed teachpacks, > including image.rkt. However, image functions (rotate, square, etc) are > undefined. Installing the teachpack from the middle column in the "add > teachpack" list fixes the issue. > > However, if the user then tries to add the teachpack and happens to click > on it in the first column, they get an error message "module: identifier > already imported from a different source". The solution that seems to work > then is to clear both teachpacks and then install the one in the middle > column. > > This behavior takes place for both Racket 5.3.4 and 5.3.6, for Windows and > Linux (Fedora 18). I don't know if it's happening on a Mac as well. > > If there is a plan to fix it in the next release, could you let me know? > We might wait a couple of weeks to upgrade our lab to 5.3.6 is we can get > an upgrade with this issue fixed. > > Many thanks! > > Elena > University of Minnesota, Morris > > > ____________________ > Racket Users list: > http://lists.racket-lang.org/**users <http://lists.racket-lang.org/users> >
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