I just get my usual errors from DrScheme prefuse/TupleSet.ss:67:49: send: target is not an object: ((class edge) (start "21") (end "129")) for method: findpair I can't find an option for a stacktrace in DrScheme how do I turn it on (I can't find it by searching the helpdesk for 'trace') I tried errortrace.ss too, - it is not giving me any joy either (debugging is on in the language settings - if that helps) Cheers, Stephen <div class="gmail_quote">On Jan 29, 2008 7:00 PM, Noel Welsh <<a href="mailto:noelwelsh@gmail.com">noelwelsh@gmail.com</a>> wrote: <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">Which bit in particular? As you must have seen if you use DrScheme you get good stack traces from it. From MzScheme you can get decent stack traces, though you lose some precision in location. Certainly you can hook up a web app written in PLT Scheme to print similar stack traces.  We do, though we print it to the logs, not the user.  And our error page isn't so ugly ;-) N. <div class="Ih2E3d"> On Jan 29, 2008 6:26 PM, Stephen De Gabrielle <<a href="mailto:spdegabrielle@gmail.com">spdegabrielle@gmail.com</a>> wrote: > Will drscheme do a stack trace like; </div>... </blockquote></div> -- Cheers, Stephen -- Stephen De Gabrielle <a href="mailto:s.degabrielle@ucl.ac.uk">s.degabrielle@ucl.ac.uk</a> Telephone +44 (0)20 7679 5242 (x45242) Mobile                  079 851 890 45 Project: Making Sense of Information (MaSI) <a href="http://www.uclic.ucl.ac.uk/annb/MaSI.html">http://www.uclic.ucl.ac.uk/annb/MaSI.html</a> UCLIC: University College London Interaction Centre <a href="http://www.uclic.ucl.ac.uk/">http://www.uclic.ucl.ac.uk/</a> Remax House - 31/32 Alfred Place London - WC1E 7DP