I have read this paper.
I encountered a problem when I tried to run the code at the end.

[image: Image.png]
After reading this article

, I added at the beginning

#lang racket
(require (lib "")) ;;<- that's what i added

(define SchemeEsq
  (unit/sig () ;; no exports
    (import mredˆ)
    ;; The repl editor class
    (define esq-text%
Then the problem becomes
unit/sig: signature not defined in: mredˆ  
Does anyone know what should I do?I don't know how to solve it. The f1 page 
doesn't work,

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