[plt-scheme] Frequent Dr. Scheme Error

If this is something you can make happen repeatably (even only one in
10 tries or something like that), then more details would be welcome.
I don't think that adding PLAI could cause that error, but you can
uninstall it and see if that helps. The easiest way is to use the
planet command-line tool. Use "planet show" to see what is installed
and "planet remove" to uninstall stuff.

hth,
Robby

On Mon, Apr 26, 2010 at 8:02 PM, David Yrueta <dyrueta at gmail.com> wrote:
> Hi All --
>
> Recently, Dr. Scheme has been crashing on me a lot. I'm running it on a Mac,
> using HtDP Advanced Student Teaching Langauge, and usually generate the
> error after Running the "Check Syntax" function.  This only started
> happening after I installed the PLAI software.
>
> Here's the error message ---
>
> sequence-contract-violation: negative: method change-style cannot be called,
> except in states (unlocked), args #(struct:object:style% ...) 7226 7245 #f
>
>  === context ===
> /Volumes/PLT Scheme v4.2.5/PLT Scheme
> v4.2.5/collects/drscheme/syncheck.ss:1877:32
> /Volumes/PLT Scheme v4.2.5/PLT Scheme
> v4.2.5/collects/scheme/private/map.ss:45:11: for-each
> /Volumes/PLT Scheme v4.2.5/PLT Scheme
> v4.2.5/collects/scheme/private/map.ss:45:11: for-each
> /Volumes/PLT Scheme v4.2.5/PLT Scheme
> v4.2.5/collects/drscheme/syncheck.ss:1817:4: annotate-variables
> /Volumes/PLT Scheme v4.2.5/PLT Scheme
> v4.2.5/collects/drscheme/syncheck.ss:1245:38
> /Volumes/PLT Scheme v4.2.5/PLT Scheme
> v4.2.5/collects/drscheme/syncheck.ss:1242:35
>
> Any suggestions?
>
> Thanks!
> Dave Yrueta
>
>
>
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