gud mode problem

[Eviatar Tron]

when I try to run gdb or dbx from emacs, I get
the following error:
gud-common-init: Wrong number of arguments: (lambda (s bag) (cond ((equal 
(length s) 0) (quote (""))) ((string-match bag s) (if (= (match-beginning 0) 
0) (cons "" (split-string (substring s (match-end 0)) bag)) (cons (substring 
s 0 (match-beginning 0)) (split-string (substring s (match-end 0)) bag)))) (t 
(cons s nil)))), 1

I havent changed anything regarding gud in my .emacs, but I did
install some new modes.
thanks
        Eviatar