Hi All --<br><br>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. <br>
<br>Here's the error message ---<br><br>sequence-contract-violation: negative: method change-style cannot be called, except in states (unlocked), args #(struct:object:style% ...) 7226 7245 #f<br><br> === context ===<br>
/Volumes/PLT Scheme v4.2.5/PLT Scheme v4.2.5/collects/drscheme/syncheck.ss:1877:32<br>/Volumes/PLT Scheme v4.2.5/PLT Scheme v4.2.5/collects/scheme/private/map.ss:45:11: for-each<br>/Volumes/PLT Scheme v4.2.5/PLT Scheme v4.2.5/collects/scheme/private/map.ss:45:11: for-each<br>
/Volumes/PLT Scheme v4.2.5/PLT Scheme v4.2.5/collects/drscheme/syncheck.ss:1817:4: annotate-variables<br>/Volumes/PLT Scheme v4.2.5/PLT Scheme v4.2.5/collects/drscheme/syncheck.ss:1245:38<br>/Volumes/PLT Scheme v4.2.5/PLT Scheme v4.2.5/collects/drscheme/syncheck.ss:1242:35<br>
<br>Any suggestions?<br><br>Thanks!<br>Dave Yrueta<br><br><br>