beamer export org 8.0.2

[Mohamed <mohamed.hibti@gmail.com>]

Dear All,
I have a problem with beamer export.
(Org-mode version 8.0.2 (8.0.2-dist @ /home/user/.emacs.d/elpa/org-20140127/)
when trying to export a small file I got the following message:

org-beamer-export-to-pdf: Wrong number of arguments: (lambda (backend file
&optional subtreep visible-only body-only ext-plist) "Call `org-export-as'
with output to a specified file.

BACKEND is the back-end used for transcoding, as a symbol.  FILE
is the name of the output file, as a string.

Optional arguments SUBTREEP, VISIBLE-ONLY, BODY-ONLY and
EXT-PLIST are similar to those used in `org-export-as', which
see.

Depending on `org-export-copy-to-kill-ring', add file contents
to kill ring.  Return output file's name." (if (file-writable-p file) nil
(error "Output file not writable")) (let ((out (org-export-as backend
subtreep visible-only body-only ext-plist))) (let ((temp-buffer
(generate-new-buffer " *temp*"))) (save-current-buffer (set-buffer
temp-buffer) (unwind-protect (progn (insert out) (let
((coding-system-for-write org-export-coding-system)) (write-file file)))
(and (buffer-name temp-buffer) (kill-buffer temp-buffer))))) (if (and
(org-export--copy-to-kill-ring-p) (org-string-nw-p out)) (progn
(org-kill-new out)))) file), 8


Any help is welcome.
Thanks