<HTML><HEAD></HEAD> <BODY dir=ltr> <DIV dir=ltr> <DIV style="FONT-SIZE: 12pt; FONT-FAMILY: 'Calibri'; COLOR: #000000"> <DIV>Hello Carl,</DIV> <DIV>Thank you for looking at this.  I am writing contracts and playing with documentation for a fairly large module that, right now, performs a system identification function.  The file is attached.  I made several changes without “Run”ning, so I’m not sure what changed caused the error.</DIV> <DIV>Thank you again for your help,</DIV> <DIV style="FONT-SIZE: 12pt; FONT-FAMILY: 'Calibri'; COLOR: #000000">Alvin Schatte<BR></DIV> <DIV style="FONT-SIZE: small; FONT-FAMILY: 'Calibri'; FONT-WEIGHT: normal; COLOR: #000000; FONT-STYLE: normal; TEXT-DECORATION: none; DISPLAY: inline"> <DIV style="FONT: 10pt tahoma"> <DIV> </DIV> <DIV style="BACKGROUND: #f5f5f5"> <DIV style="font-color: black"><B>From:</B> <A title=cce@ccs.neu.edu href="mailto:cce@ccs.neu.edu">Carl Eastlund</A> </DIV> <DIV><B>Sent:</B> Wednesday, September 04, 2013 9:06 PM</DIV> <DIV><B>To:</B> <A title=AlvinSchatte@skytex.net href="mailto:AlvinSchatte@skytex.net">Alvin Schatte</A> </DIV> <DIV><B>Cc:</B> <A title=users@racket-lang.org href="mailto:users@racket-lang.org">Racket Users</A> </DIV> <DIV><B>Subject:</B> Re: [racket] Question on error message</DIV></DIV></DIV> <DIV> </DIV></DIV> <DIV style="FONT-SIZE: small; FONT-FAMILY: 'Calibri'; FONT-WEIGHT: normal; COLOR: #000000; FONT-STYLE: normal; TEXT-DECORATION: none; DISPLAY: inline"> <DIV dir=ltr> <DIV>Alvin,<BR><BR></DIV>That looks like an internal error message from some language feature you're using, unless you're using something like begin-lifted or syntax-local-lift-expression directly.  Often the contract system generates names for internal use like "lifted.171", but there shouldn't be duplicate definitions, and if there are, it's likely not your fault.  Can you share the code that causes this error message?  If so, someone may be able to diagnose the error.  Otherwise, with just the error message, we don't have much to go on.<BR> <DIV class=gmail_extra> <DIV> </DIV> <DIV>Carl Eastlund</DIV> <DIV> </DIV> <DIV class=gmail_quote>On Wed, Sep 4, 2013 at 9:59 PM, Alvin Schatte <SPAN dir=ltr><<A href="mailto:AlvinSchatte@skytex.net" target=_blank>AlvinSchatte@skytex.net</A>></SPAN> wrote:<BR> <BLOCKQUOTE class=gmail_quote style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid"> <DIV dir=ltr> <DIV dir=ltr> <DIV style="FONT-SIZE: 12pt; FONT-FAMILY: 'Calibri'"> <DIV>Hello,</DIV> <DIV>I got the following error message after <Ctrl-R> in Dr. Racket.  I am not sure what  it means:</DIV> <DIV> </DIV> <DIV>module: duplicate definition for identifier in: lifted.171</DIV> <DIV> </DIV> <DIV>Could someone explain it to me?</DIV><SPAN class=HOEnZb><FONT color=#888888> <DIV style="FONT-SIZE: 12pt; FONT-FAMILY: 'Calibri'">Alvin Schatte<BR></DIV></FONT></SPAN></DIV></DIV></DIV><BR>____________________<BR>  Racket Users list:<BR>  <A href="http://lists.racket-lang.org/users" target=_blank>http://lists.racket-lang.org/users</A><BR><BR></BLOCKQUOTE></DIV> <DIV> </DIV></DIV></DIV><A></A> <P align=left color="#000000" avgcert??>No virus found in this message.<BR>Checked by AVG - <A href="http://www.avg.com">www.avg.com</A><BR>Version: 2013.0.3392 / Virus Database: 3222/6639 - Release Date: 09/04/13</P></DIV></DIV></DIV></BODY></HTML>