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[O] [BUG?] Org Mode 20150831, ob-R not working

From: thomas
Subject: [O] [BUG?] Org Mode 20150831, ob-R not working
Date: Wed, 02 Sep 2015 15:19:42 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Icedove/31.8.0

Hi There,

updating from Org Mode 20150713 to 20150831 (Elpa package) gives me an error at startup:

Warning (initialization): An error occurred while loading `/home/thomas/.emacs':

Invalid function: org-babel-header-args-safe-fn

To ensure normal operation, you should investigate and remove the
cause of the error in your initialization file.  Start Emacs with
the `--debug-init' option to view a complete error backtrace.

And ~emacs --debug-init~ says:

Debugger entered--Lisp error: (invalid-function org-babel-header-args-safe-fn) org-babel-header-args-safe-fn((:cache :colnames :comments :exports :epilogue :hlines :noeval :noweb :noweb-ref :noweb-sep :padline :prologue :rownames :sep :session :tangle :wrap (:eval "never" "query") (:results lambda (str) (not (string-match "file" str))) :width :height :bg :units :pointsize :antialias :quality :compression :res :type :family :title :fonts :version :paper :encoding :pagecentre :colormodel :useDingbats :horizontal)) byte-code("\301\302\303\304!#\210\305\306\307\310\311\312\313\314\315\316& \207" [ob-R-safe-header-args put org-babel-default-header-args:R safe-local-variable org-babel-header-args-safe-fn custom-declare-variable org-babel-R-command "R --slave --no-save" "Name of command to use for executing R code." :group org-babel :version "24.1" :type string] 10)
org-babel-do-load-languages(org-babel-load-languages ((awk . t) (python . t) (sql . t) (asymptote . t) (scheme \.t) (sh . t) (lilypond . t) (R . t) (ditaa . t) (dot . t) (plantuml . t) (C . t) (java \.t) (sqlite . t))) eval-buffer(#<buffer *load*> nil "/home/thomas/.emacs" nil t) ; Reading at buffer position 3634 load-with-code-conversion("/home/thomas/.emacs" "/home/thomas/.emacs" t t)
  load("~/.emacs" t t)

I'm having a problem with R. In my .emacs I load R like this:

#+BEGIN_SRC emacs-lisp
(require 'ess-site) ;; see http://orgmode.org/worg/org-tutorials/org-R/org-R.html
(org-babel-do-load-languages 'org-babel-load-languages '((R . t)))

If I remove R from babel languages, the Error disappears.

I get the same Error when I require ob-R:

#+BEGIN_SRC emacs-lisp
(require 'ob-R) ;;  Invalid function: org-babel-header-args-safe-fn

Huh, this is odd! Am I missing something?
If not, how can I revert to 20150713?

Many thanks,

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