[AUCTeX] Can't access the functionality in beamer.el

[Shunquan Tan]

Dear all,

I can't access the functionality in beamer.el. 
Press C-c C-e, can't see "frame" in the environment list,
Any suggestion?

My environment is Ubuntu 6.06+emacs-snapshot 22.0.50.1+AucTex
 11.55-3
I already put the following lines in ~/.emacs

(setq TeX-auto-save t)
(setq TeX-parse-self t)
(setq-default TeX-master nil)

M-x TeX-submit-bug-report Get:

Emacs  : GNU Emacs 
22.0.50.1 (i486-pc-linux-gnu, GTK+ Version 2.8.17)
 of 2006-08-24 on vernadsky, modified by Debian
Package: AUCTeX 11.55

current state:
==============
(setq
 window-system 'x
 LaTeX-version "2e"
 TeX-style-path '("style/" "auto/"
		  "/usr/share/emacs-snapshot/site-lisp/auctex/style/"
		  "/var/lib/auctex/emacs-snapshot/")
 TeX-auto-save t
 TeX-parse-self t

 TeX-master nil
 )