[plt-scheme] Using stepper

I am trying to use stepper to see how the code works , i am in interactive
student with lambda language and i have made a file eg1.ss
 define g (lambda(x)(+ x 1))) .When i open it in stepper and click on step
nothing  except i just get All of the definitions have been successfully
evaluated.This is maybe a very silly question but any help is appreciated.


Aditya
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