[cedet-semantic] void-function global-semantic-folding-mode

[Xtroce <xt...@gm...>]

H there, When i try to switch on code folding by adding
(global-semantic-folding-mode t)
to the .emacs file, the init crashes with the error:
Debugger entered--Lisp error: (void-function global-semantic-folding-mode)

i also took a look in the .el file and there is no
global-semantic-folding-mode function as far as i can figure out.
i'm not that good with lisp so i wanted to ask how i can switch on
code folding, or if anyone has any idea about whats going wrong

i'm using gentoo with cedet 1.90 installed and GNU Emacs 23.3.1
thanks