[racket] how to design programs chap5 error!!!

From: David Van Horn (dvanhorn at ccs.neu.edu)
Date: Mon Nov 29 22:16:22 EST 2010

 > On Nov 28, 2010, at 6:58 AM, 邢泉 wrote:
 >> Hi:
 >> Help Me! Thanks!
 >> > (master check-color)
 >> check-color: this is a procedure, so it must be applied to arguments
 >> (which requires using a parenthesis before the name)

On 11/29/10 10:10 PM, Matthias Felleisen wrote:
> How did you produce this error message?

My guess: Q. Xing defined master rather than using the master teachpack, 
which results in this error.

Make sure you add the master.ss teachpack by going to Language > Add 
Teachpack... then select master.ss.  Remove any definition of master 
that you have written.


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