Org mode export with R failing

Question

I have an org file with R code in it. When I attempt to export to html or pdf I get an error:

For example if my file was:

#+begin_src R :exports code
square <- function(x) 
{
 x * x
}

square(1:10)
#+end_src 

I type: C-c C-e h o the mini buffer says: Symbol’s value as variable is void: backend

Answer 1

I already had this line in my .emacs but I added another copy at the end of the .emacs file and it solved the problem. So maybe there is an ordering constraint for this to work correctly.

(require 'ess-site)