about racket : #lang not enabled

Question

I've got to learn how-to-design-program for a while.But once I started to use my Emacs to learn htdp, I met some problem. THE PROBLEM IS THAT: I typed #lang racket , but it just show:

  > stdin::7: read: #lang not enabled in the current context
  context...:
   /usr/share/racket/collects/racket/private/misc.rkt:87:7
  > racket: undefined;
  cannot reference undefined identifier
  context...:
   /usr/share/racket/collects/racket/private/misc.rkt:87:7

And I use 'require' to load path.

 stdin::30: cannot open module file
  module path: #<path:/Desktop/htdp/convert.rkt>
  path: /Desktop/htdp/convert.rkt
  system error: No such file or directory; errno=2
  context...:
   standard-module-name-resolver
   /usr/share/racket/collects/racket/private/misc.rkt:87:7

Also it can not work.

Can you help me to solve it? P.S my system is Fedora20.

Which emacs mode are you using? Which version of Racket have you installed? (If possible use the version from download.racket-lang.org) — soegaard
If you are using (require "/Desktop/htdp/convert.rkt") it is likely that you really want (require "/home/<your-user-name>/Desktop/htdp/convert.rkt") or just (require "convert.rkt") if it is in the same directory as the file you are working on. — ben rudgers
I installed Racket from racket-lang.org , I use paredit as my Emacs mode. — Arthas Dark
yeah , I've tried (require “/home/....”) and (require "convert.rkt") but still it cannot work. just told me that the directory is wrong. — Arthas Dark

ಠ_ಠ ಠ_ಠ · Accepted Answer · 2014-09-03T03:11:31

When you're running a racket script from the console, you shouldn't need to define the language on the first line. This flag

racket -I <language>

can be used to specify a language when running from the command line. #lang racket should be the default, so just remove the line and run your script from the command line using the racket command.

about racket : #lang not enabled

2 Answers