[racket] Question on error message

From: Alvin Schatte (AlvinSchatte at skytex.net)
Date: Wed Sep 4 21:59:30 EDT 2013

Hello,
I got the following error message after <Ctrl-R> in Dr. Racket.  I am not sure what  it means:

module: duplicate definition for identifier in: lifted.171

Could someone explain it to me?
Alvin Schatte
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