[hunchentoot-devel] Why doesn't *show-lisp-backtraces-p* work?

Hi, Who can give me a help ? I did this: (setf *show-lisp-errors-p* T) (setf *show-lisp-backtraces-p* T) But the *show-lisp-backtraces-p* seems that it does not work. I can't see any backtraces on the page. Did I use it by a wrong way? Thanks.