JDE debugging problems

Hi! At work, using XEmacs 21.4 (or .5) on Win2k/Cygwin, I get the following error when trying to debug a Java application: ,----[ message.txt ] | Emacs connected to standard IO port 3581 for process webserviceclient.WebServiceMain. | Launched VM Java Debug Interface (Reference Implementation) version 1.3 | Java Debug Wire Protocol (Reference Implementation) version 1.4 | JVM Debug Interface version 1.3 | JVM version 1.4.2_01 (Java HotSpot(TM) Client VM, mixed mode) | initSIOConnect: starting standard I/O handshake. | initSIOConnect: starting SIO connect thread. | Debugger waiting for Emacs to connect to app SIO port 3581. | Running webserviceclient.WebServiceMain. | Debugger connected to standard I/O socket. | Closed transport for application's standard output. | Closed transport for application's standard error output. | webserviceclient.WebServiceMain process ended. | Error: evaluating debugger output caused a Lisp error. | See *messages* buffer for details. | Error: evaluating output from the debugger caused a Lisp error. | Debugger output: (jde-dbo-event-set 1 "none" nil | (list 'jde-dbo-vm-death-event)). | Lisp error: (void-variable old-assoc) | vm disconnected... | Error: evaluating debugger output caused a Lisp error. | See *messages* buffer for details. | Error: evaluating output from the debugger caused a Lisp error. | Debugger output: | (jde-dbo-event-set 1 "none" nil | (list 'jde-dbo-vm-disconnected-event)). | Fontifying *JDEbug*... done. | Lisp error: (void-variable old-assoc) `---- Pilot error or really a problem? Thanks, norbert.