use jdb in emacs21.4 on suse linux

HI all:
   when i use jde's jdb in emacs21.4 on suse linux, encounter next problem at display variable. how to resolve it ? thanks

   Peter

signal: Invalid function: [object jde-db-jdb-1-4 "jdb 1.4" "jdb" "*debugDeleteEntry*" #<buffer *debugDeleteEntry*> #<process *debugDeleteEntry*> t unbound ([object jde-jdb-stack-listener "jdb stack listener" #0 ""] [object jde-jdb-breakpoint-listener "jdb breakpoint listener" #0 "^.*: \"thread=.*\", \\(\\(.*[.]\\)*\\)\\([^$]*\\)\\($.*\\)*[.].+(), line=\\([0-9,.]*\\)" 3 5 "^Breakpoint hit: .*(pc \\([0-9]*\\))" ""]) ...]