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Cryptic error message in emacs org-mode following attempted export of file containing image-generating block of R code

Submitted by John Horton on February 4, 2012

I have an R code block that generates an image (see below). Executing the code is no problem (i.e., C-c C-c from within the block generates an image temp.png as expected). However, on export to PDF via LaTeX, there is an error message: 

org-babel-sha1-hash: Wrong number of arguments: called-interactively-p, 1

The only other reference to this error (sans the bit about sha1) is from here, http://xahlee.org/emacs/elisp_byte_compile_problem.html in a very diffirent context.

The code block closely follows the example from this previous question Embedding R plots in Latex via org-mode
Here's the code:

#+NAME: optimal_applications 
#+BEGIN_SRC R  :results graphics :file temp.png :exports both  
require(ggplot2) 
c <- c(.01, .05, .10) 
df <- data.frame(q =
  rep((0:100)/100, length(c)), 
c = c(sapply(c, function(x) rep(x,  101))) )
 
df$s.star <- with(df, log(-c/log(1-q))/log(1-q))
df$s.star[df$s.star < 0] <- 0
 
g <- ggplot(df, aes(x = q, y = s.star, colour=factor(c))) + geom_line(aes(group=factor(c))) +
    xlab("Probability that an application is successful") +
    ylab("Optimal number of applications to send")
print(g) 
#+END_SRC

Update: org-mode & emacs version 

Org-mode version 7.8.03 (release_7.8.03.267.g1c8eb)
GNU Emacs 23.2.1 (x86_64-pc-linux-gnu, GTK+ Version 2.24.4) of 2011-04-04 on crested, modified by Debian